1888–89 United States Senate elections#New Hampshire

{{Infobox election

| election_name = 1888–89 United States Senate elections

| country = United States

| flag_year = 1877

| type = legislative

| ongoing = no

| previous_election = 1886–87 United States Senate elections

| previous_year = {{Nowrap|1886 & 1887}}

| next_election = 1890–91 United States Senate elections

| next_year = {{Nowrap|1890 & 1891}}

| seats_for_election = 26 of the 76 seats in the United States Senate (as well as special elections)

| majority_seats = 39

| election_date = Dates vary by state

| 1blank = Seats up

| 2blank = Races won

| image_size = x180px

| party1 = Republican Party (US)

| leader1 = George F. Edmunds{{efn | as Republican Conference Chair}}

| image1 = George F. Edmunds - Brady-Handy.jpg

| leader_since1 = March 4, 1885

| leaders_seat1 = Vermont

| seats_before1 = 38

| seats_after1 = 38

| seat_change1 = {{steady}}

| 1data1 = 12

| 2data1 = 12

| party2 = Democratic Party (US)

| leader2 = James B. Beck{{efn | as Democratic Caucus Chair}}
(retired)

| image2 = James B. Beck - Brady-Handy.jpg

| leader_since2 = March 4, 1885

| leaders_seat2 = Kentucky

| seats_before2 = 37

| seats_after2 = 37

| seat_change2 = {{steady}}

| 1data2 = 13

| 2data2 = 13

| party3 = Readjuster Party

| leader3 = Harrison H. Riddleberger{{efn | as the leader of Readjuster Party}}
(retired)

| image3 = Harrison_H._Riddleberger_-_Brady-Handy.jpg

| leader_since3 = March 4, 1887

| leaders_seat3 = Virginia

| seats_before3 = 1

| seats_after3 = 0

| seat_change3 = {{decrease}} 1

| 1data3 = 1

| 2data3 = 0

| title = Majority Party

| before_election =

| before_party = Republican{{Efn|name=caucus|The Readjusters caucused with the Republicans.}}

| after_election =

| after_party = Republican{{Efn|name=caucus}}

| map_image = 370px

| map_caption = Results of the elections:
{{legend0|#0671B0|Democratic gain}} {{legend0|#92C5DE|Democratic hold}}
{{legend0|#CA0120|Republican gain}} {{legend0|#F48882|Republican hold}}
{{legend0|#000000|Legislature failed to elect}}

}}

The 1888–89 United States Senate elections were held on various dates in various states, coinciding with Benjamin Harrison's victory over incumbent President Grover Cleveland. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1888 and 1889, and a seat may have been filled months late or remained vacant due to legislative deadlock.{{cite web|url=https://www.archives.gov/milestone-documents/17th-amendment|title=17th Amendment to the U.S. Constitution: Direct Election of U.S. Senators (1913)|website=National Archives and Records Administration|date=February 8, 2022}} In these elections, terms were up for the senators in Class 2.

Both parties were unchanged in the regular elections, but later special elections would give Republicans an eightseat majority, mostly from newly admitted states.

Results summary

Senate party division, 51st Congress (1889–1891)

Majority party: Republican (39 to 51)
Minority party: Democratic (37 to 35)
Other parties: (0)
Total seats: 76 to 88

Change in Senate composition

= Before the elections =

class="wikitable" style="text-align:center" width=750px

{{Party shading/Democratic}} | D{{Sub|8}}

| {{Party shading/Democratic}} | D{{Sub|7}}

| {{Party shading/Democratic}} | D{{Sub|6}}

| {{Party shading/Democratic}} | D{{Sub|5}}

| {{Party shading/Democratic}} | D{{Sub|4}}

| {{Party shading/Democratic}} | D{{Sub|3}}

| {{Party shading/Democratic}} | D{{Sub|2}}

| {{Party shading/Democratic}} | D{{Sub|1}}

| colspan=2 |

width=50px {{Party shading/Democratic}} | D{{Sub|9}}

| width=50px {{Party shading/Democratic}} | D{{Sub|10}}

| width=50px {{Party shading/Democratic}} | D{{Sub|11}}

| width=50px {{Party shading/Democratic}} | D{{Sub|12}}

| width=50px {{Party shading/Democratic}} | D{{Sub|13}}

| width=50px {{Party shading/Democratic}} | D{{Sub|14}}

| width=50px {{Party shading/Democratic}} | D{{Sub|15}}

| width=50px {{Party shading/Democratic}} | D{{Sub|16}}

| width=50px {{Party shading/Democratic}} | D{{Sub|17}}

| width=50px {{Party shading/Democratic}} | D{{Sub|18}}

{{Party shading/Democratic/active}} | D{{Sub|28}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|27}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|26}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|25}}
{{Small|Ran}}

| {{Party shading/Democratic}} | D{{Sub|24}}

| {{Party shading/Democratic}} | D{{Sub|23}}

| {{Party shading/Democratic}} | D{{Sub|22}}

| {{Party shading/Democratic}} | D{{Sub|21}}

| {{Party shading/Democratic}} | D{{Sub|20}}

| {{Party shading/Democratic}} | D{{Sub|19}}

{{Party shading/Democratic/active}} | D{{Sub|29}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|30}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|31}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|32}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|33}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|34}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|35}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|36}}
{{Small|Ran}}

| {{Party shading/Democratic/active}} | D{{Sub|37}}
{{Small|Ran}}

| {{Party shading/Readjuster/active}} | {{white|RA{{Sub|1}}
{{Small|Retired}}}}

colspan=9 align=right | Majority with Readjuster in caucus →

| rowspan=2 {{Party shading/Republican/active}} | R{{Sub|38}}
{{Small|Retired}}

{{Party shading/Republican/active}} | R{{Sub|29}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|30}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|31}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|32}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|33}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|34}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|35}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|36}}
{{Small|Unknown}}

| {{Party shading/Republican/active}} | R{{Sub|37}}
{{Small|Unknown}}

{{Party shading/Republican/active}} | R{{Sub|28}}
{{Small|Ran}}

| {{Party shading/Republican/active}} | R{{Sub|27}}
{{Small|Ran}}

| {{Party shading/Republican}} | R{{Sub|26}}

| {{Party shading/Republican}} | R{{Sub|25}}

| {{Party shading/Republican}} | R{{Sub|24}}

| {{Party shading/Republican}} | R{{Sub|23}}

| {{Party shading/Republican}} | R{{Sub|22}}

| {{Party shading/Republican}} | R{{Sub|21}}

| {{Party shading/Republican}} | R{{Sub|20}}

| {{Party shading/Republican}} | R{{Sub|19}}

{{Party shading/Republican}} | R{{Sub|9}}

| {{Party shading/Republican}} | R{{Sub|10}}

| {{Party shading/Republican}} | R{{Sub|11}}

| {{Party shading/Republican}} | R{{Sub|12}}

| {{Party shading/Republican}} | R{{Sub|13}}

| {{Party shading/Republican}} | R{{Sub|14}}

| {{Party shading/Republican}} | R{{Sub|15}}

| {{Party shading/Republican}} | R{{Sub|16}}

| {{Party shading/Republican}} | R{{Sub|17}}

| {{Party shading/Republican}} | R{{Sub|18}}

{{Party shading/Republican}} | R{{Sub|8}}

| {{Party shading/Republican}} | R{{Sub|7}}

| {{Party shading/Republican}} | R{{Sub|6}}

| {{Party shading/Republican}} | R{{Sub|5}}

| {{Party shading/Republican}} | R{{Sub|4}}

| {{Party shading/Republican}} | R{{Sub|3}}

| {{Party shading/Republican}} | R{{Sub|2}}

| {{Party shading/Republican}} | R{{Sub|1}}

| colspan=2 |

= After the elections =

class="wikitable" style="text-align:center" width=750px

{{Party shading/Democratic}} | D{{Sub|8}}

| {{Party shading/Democratic}} | D{{Sub|7}}

| {{Party shading/Democratic}} | D{{Sub|6}}

| {{Party shading/Democratic}} | D{{Sub|5}}

| {{Party shading/Democratic}} | D{{Sub|4}}

| {{Party shading/Democratic}} | D{{Sub|3}}

| {{Party shading/Democratic}} | D{{Sub|2}}

| {{Party shading/Democratic}} | D{{Sub|1}}

| colspan=2 |

width=50px {{Party shading/Democratic}} | D{{Sub|9}}

| width=50px {{Party shading/Democratic}} | D{{Sub|10}}

| width=50px {{Party shading/Democratic}} | D{{Sub|11}}

| width=50px {{Party shading/Democratic}} | D{{Sub|12}}

| width=50px {{Party shading/Democratic}} | D{{Sub|13}}

| width=50px {{Party shading/Democratic}} | D{{Sub|14}}

| width=50px {{Party shading/Democratic}} | D{{Sub|15}}

| width=50px {{Party shading/Democratic}} | D{{Sub|16}}

| width=50px {{Party shading/Democratic}} | D{{Sub|17}}

| width=50px {{Party shading/Democratic}} | D{{Sub|18}}

{{Party shading/Democratic/active}} | D{{Sub|28}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|27}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|26}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|25}}
{{Small|Re-elected}}

| {{Party shading/Democratic}} | D{{Sub|24}}

| {{Party shading/Democratic}} | D{{Sub|23}}

| {{Party shading/Democratic}} | D{{Sub|22}}

| {{Party shading/Democratic}} | D{{Sub|21}}

| {{Party shading/Democratic}} | D{{Sub|20}}

| {{Party shading/Democratic}} | D{{Sub|19}}

{{Party shading/Democratic/active}} | D{{Sub|29}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|30}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|31}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|32}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|33}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|34}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|35}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|36}}
{{Small|Re-elected}}

| {{Party shading/Democratic/active}} | D{{Sub|37}}
{{Small|Gain}}

| {{Party shading/Vacant/active}} | V{{Sub|1}}
{{Small|R Loss}}

colspan=9 align=right | Majority due to vacancy →

| rowspan=2 {{Party shading/Republican/active}} | R{{Sub|38}}
{{Small|Gain}}

{{Party shading/Republican/active}} | R{{Sub|29}}
{{Small|Re-elected}}

| {{Party shading/Republican/active}} | R{{Sub|30}}
{{Small|Re-elected}}

| {{Party shading/Republican/active}} | R{{Sub|31}}
{{Small|Re-elected}}

| {{Party shading/Republican/active}} | R{{Sub|32}}
{{Small|Re-elected}}

| {{Party shading/Republican/active}} | R{{Sub|33}}
{{Small|Re-elected}}

| {{Party shading/Republican/active}} | R{{Sub|39}}
{{Small|Re-elected}}

| {{Party shading/Republican/active}} | R{{Sub|35}}
{{Small|Hold}}

| {{Party shading/Republican/active}} | R{{Sub|36}}
{{Small|Hold}}

| {{Party shading/Republican/active}} | R{{Sub|37}}
{{Small|Hold}}

{{Party shading/Republican/active}} | R{{Sub|28}}
{{Small|Re-elected}}

| {{Party shading/Republican/active}} | R{{Sub|27}}
{{Small|Re-elected}}

| {{Party shading/Republican}} | R{{Sub|26}}

| {{Party shading/Republican}} | R{{Sub|25}}

| {{Party shading/Republican}} | R{{Sub|24}}

| {{Party shading/Republican}} | R{{Sub|23}}

| {{Party shading/Republican}} | R{{Sub|22}}

| {{Party shading/Republican}} | R{{Sub|21}}

| {{Party shading/Republican}} | R{{Sub|20}}

| {{Party shading/Republican}} | R{{Sub|19}}

{{Party shading/Republican}} | R{{Sub|9}}

| {{Party shading/Republican}} | R{{Sub|10}}

| {{Party shading/Republican}} | R{{Sub|11}}

| {{Party shading/Republican}} | R{{Sub|12}}

| {{Party shading/Republican}} | R{{Sub|13}}

| {{Party shading/Republican}} | R{{Sub|14}}

| {{Party shading/Republican}} | R{{Sub|15}}

| {{Party shading/Republican}} | R{{Sub|16}}

| {{Party shading/Republican}} | R{{Sub|17}}

| {{Party shading/Republican}} | R{{Sub|18}}

{{Party shading/Republican}} | R{{Sub|8}}

| {{Party shading/Republican}} | R{{Sub|7}}

| {{Party shading/Republican}} | R{{Sub|6}}

| {{Party shading/Republican}} | R{{Sub|5}}

| {{Party shading/Republican}} | R{{Sub|4}}

| {{Party shading/Republican}} | R{{Sub|3}}

| {{Party shading/Republican}} | R{{Sub|2}}

| {{Party shading/Republican}} | R{{Sub|1}}

| colspan=2 |

= Beginning of the next Congress =

class="wikitable" style="text-align:center" width=750px

{{Party shading/Democratic}} | D{{Sub|8}}

| {{Party shading/Democratic}} | D{{Sub|7}}

| {{Party shading/Democratic}} | D{{Sub|6}}

| {{Party shading/Democratic}} | D{{Sub|5}}

| {{Party shading/Democratic}} | D{{Sub|4}}

| {{Party shading/Democratic}} | D{{Sub|3}}

| {{Party shading/Democratic}} | D{{Sub|2}}

| {{Party shading/Democratic}} | D{{Sub|1}}

| colspan=2 |

width=50px {{Party shading/Democratic}} | D{{Sub|9}}

| width=50px {{Party shading/Democratic}} | D{{Sub|10}}

| width=50px {{Party shading/Democratic}} | D{{Sub|11}}

| width=50px {{Party shading/Democratic}} | D{{Sub|12}}

| width=50px {{Party shading/Democratic}} | D{{Sub|13}}

| width=50px {{Party shading/Democratic}} | D{{Sub|14}}

| width=50px {{Party shading/Democratic}} | D{{Sub|15}}

| width=50px {{Party shading/Democratic}} | D{{Sub|16}}

| width=50px {{Party shading/Democratic}} | D{{Sub|17}}

| width=50px {{Party shading/Democratic}} | D{{Sub|18}}

{{Party shading/Democratic}} | D{{Sub|28}}

| {{Party shading/Democratic}} | D{{Sub|27}}

| {{Party shading/Democratic}} | D{{Sub|26}}

| {{Party shading/Democratic}} | D{{Sub|25}}

| {{Party shading/Democratic}} | D{{Sub|24}}

| {{Party shading/Democratic}} | D{{Sub|23}}

| {{Party shading/Democratic}} | D{{Sub|22}}

| {{Party shading/Democratic}} | D{{Sub|21}}

| {{Party shading/Democratic}} | D{{Sub|20}}

| {{Party shading/Democratic}} | D{{Sub|19}}

{{Party shading/Democratic}} | D{{Sub|29}}

| {{Party shading/Democratic}} | D{{Sub|30}}

| {{Party shading/Democratic}} | D{{Sub|31}}

| {{Party shading/Democratic}} | D{{Sub|32}}

| {{Party shading/Democratic}} | D{{Sub|33}}

| {{Party shading/Democratic}} | D{{Sub|34}}

| {{Party shading/Democratic}} | D{{Sub|35}}

| {{Party shading/Democratic}} | D{{Sub|36}}

| {{Party shading/Democratic}} | D{{Sub|37}}

| rowspan=2 {{Party shading/Republican/active}} | R{{Sub|39}}
{{Small|Gain}}

colspan=9 align=right | Majority →

{{Party shading/Republican}} | R{{Sub|29}}

| {{Party shading/Republican}} | R{{Sub|30}}

| {{Party shading/Republican}} | R{{Sub|31}}

| {{Party shading/Republican}} | R{{Sub|32}}

| {{Party shading/Republican}} | R{{Sub|33}}

| {{Party shading/Republican}} | R{{Sub|34}}

| {{Party shading/Republican}} | R{{Sub|35}}

| {{Party shading/Republican}} | R{{Sub|36}}

| {{Party shading/Republican}} | R{{Sub|37}}

| {{Party shading/Republican}} | R{{Sub|38}}

{{Party shading/Republican}} | R{{Sub|28}}

| {{Party shading/Republican}} | R{{Sub|27}}

| {{Party shading/Republican}} | R{{Sub|26}}

| {{Party shading/Republican}} | R{{Sub|25}}

| {{Party shading/Republican}} | R{{Sub|24}}

| {{Party shading/Republican}} | R{{Sub|23}}

| {{Party shading/Republican}} | R{{Sub|22}}

| {{Party shading/Republican}} | R{{Sub|21}}

| {{Party shading/Republican}} | R{{Sub|20}}

| {{Party shading/Republican}} | R{{Sub|19}}

{{Party shading/Republican}} | R{{Sub|9}}

| {{Party shading/Republican}} | R{{Sub|10}}

| {{Party shading/Republican}} | R{{Sub|11}}

| {{Party shading/Republican}} | R{{Sub|12}}

| {{Party shading/Republican}} | R{{Sub|13}}

| {{Party shading/Republican}} | R{{Sub|14}}

| {{Party shading/Republican}} | R{{Sub|15}}

| {{Party shading/Republican}} | R{{Sub|16}}

| {{Party shading/Republican}} | R{{Sub|17}}

| {{Party shading/Republican}} | R{{Sub|18}}

{{Party shading/Republican}} | R{{Sub|8}}

| {{Party shading/Republican}} | R{{Sub|7}}

| {{Party shading/Republican}} | R{{Sub|6}}

| {{Party shading/Republican}} | R{{Sub|5}}

| {{Party shading/Republican}} | R{{Sub|4}}

| {{Party shading/Republican}} | R{{Sub|3}}

| {{Party shading/Republican}} | R{{Sub|2}}

| {{Party shading/Republican}} | R{{Sub|1}}

| colspan=2 |

= End of 1889 =

class="wikitable" style="text-align:center" width=750px

colspan=9 |

| {{Party shading/Democratic}} | D{{Sub|1}}

width=50px {{Party shading/Democratic}} | D{{Sub|11}}

| width=50px {{Party shading/Democratic}} | D{{Sub|10}}

| width=50px {{Party shading/Democratic}} | D{{Sub|9}}

| width=50px {{Party shading/Democratic}} | D{{Sub|8}}

| width=50px {{Party shading/Democratic}} | D{{Sub|7}}

| width=50px {{Party shading/Democratic}} | D{{Sub|6}}

| width=50px {{Party shading/Democratic}} | D{{Sub|5}}

| width=50px {{Party shading/Democratic}} | D{{Sub|4}}

| width=50px {{Party shading/Democratic}} | D{{Sub|3}}

| width=50px {{Party shading/Democratic}} | D{{Sub|2}}

{{Party shading/Democratic}} | D{{Sub|12}}

| {{Party shading/Democratic}} | D{{Sub|13}}

| {{Party shading/Democratic}} | D{{Sub|14}}

| {{Party shading/Democratic}} | D{{Sub|15}}

| {{Party shading/Democratic}} | D{{Sub|16}}

| {{Party shading/Democratic}} | D{{Sub|17}}

| {{Party shading/Democratic}} | D{{Sub|18}}

| {{Party shading/Democratic}} | D{{Sub|19}}

| {{Party shading/Democratic}} | D{{Sub|20}}

| {{Party shading/Democratic}} | D{{Sub|21}}

{{Party shading/Democratic}} | D{{Sub|31}}

| {{Party shading/Democratic}} | D{{Sub|30}}

| {{Party shading/Democratic}} | D{{Sub|29}}

| {{Party shading/Democratic}} | D{{Sub|28}}

| {{Party shading/Democratic}} | D{{Sub|27}}

| {{Party shading/Democratic}} | D{{Sub|26}}

| {{Party shading/Democratic}} | D{{Sub|25}}

| {{Party shading/Democratic}} | D{{Sub|24}}

| {{Party shading/Democratic}} | D{{Sub|23}}

| {{Party shading/Democratic}} | D{{Sub|22}}

{{Party shading/Democratic}} | D{{Sub|32}}

| {{Party shading/Democratic}} | D{{Sub|33}}

| {{Party shading/Democratic}} | D{{Sub|34}}

| {{Party shading/Democratic}} | D{{Sub|35}}

| {{Party shading/Democratic}} | D{{Sub|36}}

| {{Party shading/Democratic}} | D{{Sub|37}}

| {{Party shading/Republican/active}} | R{{Sub|45}}
{{Small|New state}}

| {{Party shading/Republican/active}} | R{{Sub|44}}
{{Small|New state}}

| {{Party shading/Republican/active}} | R{{Sub|43}}
{{Small|New state}}

| rowspan=2 {{Party shading/Republican/active}} | R{{Sub|42}}
{{Small|New state}}

colspan=9 align=right | Majority →

{{Party shading/Republican}} | R{{Sub|32}}

| {{Party shading/Republican/active}} | R{{Sub|33}}
{{Small|Hold}}

| {{Party shading/Republican/active}} | R{{Sub|34}}
{{Small|Hold}}

| {{Party shading/Republican}} | R{{Sub|35}}

| {{Party shading/Republican}} | R{{Sub|36}}

| {{Party shading/Republican}} | R{{Sub|37}}

| {{Party shading/Republican}} | R{{Sub|38}}

| {{Party shading/Republican}} | R{{Sub|39}}

| {{Party shading/Republican/active}} | R{{Sub|40}}
{{Small|New state}}

| {{Party shading/Republican/active}} | R{{Sub|41}}
{{Small|New state}}

{{Party shading/Republican}} | R{{Sub|31}}

| {{Party shading/Republican}} | R{{Sub|30}}

| {{Party shading/Republican}} | R{{Sub|29}}

| {{Party shading/Republican}} | R{{Sub|28}}

| {{Party shading/Republican}} | R{{Sub|27}}

| {{Party shading/Republican}} | R{{Sub|26}}

| {{Party shading/Republican}} | R{{Sub|25}}

| {{Party shading/Republican}} | R{{Sub|24}}

| {{Party shading/Republican}} | R{{Sub|23}}

| {{Party shading/Republican}} | R{{Sub|22}}

{{Party shading/Republican}} | R{{Sub|12}}

| {{Party shading/Republican}} | R{{Sub|13}}

| {{Party shading/Republican}} | R{{Sub|14}}

| {{Party shading/Republican}} | R{{Sub|15}}

| {{Party shading/Republican}} | R{{Sub|16}}

| {{Party shading/Republican}} | R{{Sub|17}}

| {{Party shading/Republican}} | R{{Sub|18}}

| {{Party shading/Republican}} | R{{Sub|19}}

| {{Party shading/Republican}} | R{{Sub|20}}

| {{Party shading/Republican}} | R{{Sub|21}}

{{Party shading/Republican}} | R{{Sub|11}}

| {{Party shading/Republican}} | R{{Sub|10}}

| {{Party shading/Republican}} | R{{Sub|9}}

| {{Party shading/Republican}} | R{{Sub|8}}

| {{Party shading/Republican}} | R{{Sub|7}}

| {{Party shading/Republican}} | R{{Sub|6}}

| {{Party shading/Republican}} | R{{Sub|5}}

| {{Party shading/Republican}} | R{{Sub|4}}

| {{Party shading/Republican}} | R{{Sub|3}}

| {{Party shading/Republican}} | R{{Sub|2}}

colspan=9 |

| {{Party shading/Republican}} | R{{Sub|1}}

valign=top

! Key:

{| class=wikitable

align=center width=35px {{Party shading/Democratic}} | D{{Sub|#}}

| Democratic

align=center width=35px {{Party shading/Readjuster}} | {{white|RA{{Sub|#}}}}

| Readjuster

align=center width=35px {{Party shading/Republican}} | R{{Sub|#}}

| Republican

align=center width=35px {{Party shading/Vacant}} | V{{Sub|#}}

| Vacant

Race summaries

= Special elections during the 50th Congress =

There were no special elections during 1888 or in 1889 before March 4.

= Races leading to the 51st Congress =

In these regular elections, the winners were elected for the term beginning March 4, 1889; ordered by state.

All of the elections involved the Class 2 seats.

class=wikitable
valign=bottom ! rowspan=2 \| State ! colspan=3 \| Incumbent ! rowspan=2 \| Results ! rowspan=2 \| Candidates
valign=bottom ! Senator ! Party ! Electoral history
Alabama \| John T. Morgan \| {{Party shading/Democratic}} \| Democratic \| 1876 1882 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} John T. Morgan (Democratic) {{dm\|date=February 2020}} }}
Arkansas \| James H. Berry \| {{Party shading/Democratic}} \| Democratic \| 1885 United States Senate special election in Arkansas \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} James H. Berry (Democratic) {{dm\|date=February 2020}} }}
Colorado \| Thomas M. Bowen \| {{Party shading/Republican}} \| Republican \| 1882–83 \| {{Party shading/Republican/Hold}} \| Incumbent retired or lost re-election. New senator elected in 1889. Republican hold. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Edward O. Wolcott (Republican) {{dm\|date=February 2020}} }}
Delaware \| Eli Saulsbury \| {{Party shading/Democratic}} \| Democratic \| 1870 1876 1883 \| {{Party shading/Republican}} \| Incumbent lost re-election. New senator elected in 1888 or 1889. Republican gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Anthony C. Higgins (Republican) {{Party stripe\|Democratic Party (US)}}Eli Saulsbury (Democratic) {{dm\|date=February 2020}} }}
Georgia \| Alfred H. Colquitt \| {{Party shading/Democratic}} \| Democratic \| 1883 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} Alfred H. Colquitt (Democratic) {{dm\|date=February 2020}} }}
Illinois \| Shelby M. Cullom \| {{Party shading/Republican}} \| Republican \| 1882 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Shelby M. Cullom (Republican) {{dm\|date=February 2020}} }}
Iowa \| James F. Wilson \| {{Party shading/Republican}} \| Republican \| 1882 \| Incumbent re-elected January 25, 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} James F. Wilson (Republican){{sfn \| Clark \| page=214}} {{Party stripe\|Democratic Party (US)}}Thomas J. Anderson (Democratic) {{Party stripe\|Unknown}}Daniel Campbell (Unknown){{efn \| name=Clark215 \| Campbell, Reed, Hull, and Wallace each received between one and three votes.{{sfn \| Clark \| page=215}}}} {{Party stripe\|Unknown}}J. R. Reed (Unknown){{efn \| name=Clark215}} {{Party stripe\|Republican Party (US)}}John A. T. Hull (Republican){{efn \| name=Clark215}} {{Party stripe\|Republican Party (US)}}Henry C. Wallace (Republican){{efn \| name=Clark215}} }}
Kansas \| Preston B. Plumb \| {{Party shading/Republican}} \| Republican \| 1877 1883 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Preston B. Plumb (Republican) {{dm\|date=February 2020}} }}
Kentucky \| James B. Beck \| {{Party shading/Democratic}} \| Democratic \| 1876 1882 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} James B. Beck (Democratic) {{dm\|date=February 2020}} }}
Louisiana \| Randall L. Gibson \| {{Party shading/Democratic}} \| Democratic \| 1882 \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} Randall L. Gibson (Democratic) {{dm\|date=February 2020}} }}
Maine \| William P. Frye \| {{Party shading/Republican}} \| Republican \| nowrap \| 1881 United States Senate special election in Maine 1883 \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} William P. Frye (Republican) {{dm\|date=February 2020}} }}
Massachusetts \| George F. Hoar \| {{Party shading/Republican}} \| Republican \| 1877 1883 \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} George F. Hoar (Republican) {{dm\|date=February 2020}} }}
Michigan \| Thomas W. Palmer \| {{Party shading/Republican}} \| Republican \| 1882–83 \| {{Party shading/Republican/Hold}} \| Incumbent retired. New senator elected in 1889. Republican hold. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} James McMillan (Republican) {{dm\|date=February 2020}} }}
Minnesota \| Dwight M. Sabin \| {{Party shading/Republican}} \| Republican \| 1883 \| {{Party shading/Republican/Hold}} \| Incumbent lost renomination. New senator elected in 1888. Republican hold. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} W. D. Washburn (Republican) {{dm\|date=February 2020}} }}
Mississippi \| Edward C. Walthall \| {{Party shading/Democratic}} \| Democratic \| 1885 {{Small\|(appointed)}} 1886 United States Senate special election in Mississippi \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} Edward C. Walthall (Democratic) {{dm\|date=February 2020}} }}
Nebraska \| Charles F. Manderson \| {{Party shading/Republican}} \| Republican \| 1883 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Charles F. Manderson (Republican) {{dm\|date=February 2020}} }}
New Hampshire \| William E. Chandler \| {{Party shading/Republican}} \| Republican \| 1887 United States Senate special election in New Hampshire \| {{Party shading/Loss}} \| Unknown if incumbent retired or lost re-election. Legislature failed to elect. Republican loss. Gilman Marston (R) was appointed to start the next term and Chandler was later elected to finish the term; see below. \| {{dm\|date=February 2020}}
New Jersey \| John R. McPherson \| {{Party shading/Democratic}} \| Democratic \| 1877 1883 \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} John R. McPherson (Democratic) 43 {{Party stripe\|Republican Party (US)}} William J. Sewell (Republican) 38 }}
North Carolina \| Matt W. Ransom \| {{Party shading/Democratic}} \| Democratic \| 1872 United States Senate special election in North Carolina 1876 1883 \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} Matt W. Ransom (Democratic) {{dm\|date=February 2020}} }}
Oregon \| Joseph N. Dolph \| {{Party shading/Republican}} \| Republican \| 1882 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Joseph N. Dolph (Republican) {{dm\|date=February 2020}} }}
Rhode Island \| Jonathan Chace \| {{Party shading/Republican}} \| Republican \| 1885 United States Senate special election in Rhode Island \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Jonathan Chace (Republican) {{dm\|date=February 2020}} }}
South Carolina \| Matthew Butler \| {{Party shading/Democratic}} \| Democratic \| 1876 1882 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} Matthew Butler (Democratic) {{dm\|date=February 2020}} }}
Tennessee \| Isham G. Harris \| {{Party shading/Democratic}} \| Democratic \| 1877 1883 \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} Isham G. Harris (Democratic) {{dm\|date=February 2020}} }}
Texas \| Richard Coke \| {{Party shading/Democratic}} \| Democratic \| 1876 1882 \| Incumbent re-elected in 1888. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} Richard Coke (Democratic) {{dm\|date=February 2020}} }}
Virginia \| Harrison H. Riddleberger \| {{Party shading/Readjuster}} \| {{white\|Readjuster}} \| 1881 \| {{party shading/Democratic}} \| Incumbent retired. New senator elected early December 20, 1887.[http://www.encyclopediavirginia.org/Barbour_John_S_1820-1892 John S. Barbour Jr.] at Encyclopedia Virginia Democratic gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} John S. Barbour Jr. (Democratic) {{dm\|date=February 2020}} }}
West Virginia \| John E. Kenna \| {{Party shading/Democratic}} \| Democratic \| 1883 \| Incumbent re-elected in 1889. \| nowrap \| {{Plainlist \| {{Party stripe\|Democratic Party (US)}}{{Aye}} John E. Kenna (Democratic) {{dm\|date=February 2020}} }}

class=wikitable

valign=bottom

! rowspan=2 | State

! colspan=3 | Incumbent

! rowspan=2 | Results

! rowspan=2 | Candidates

valign=bottom

! Senator

! Party

! Electoral
history

Alabama

| John T. Morgan

| {{Party shading/Democratic}} | Democratic

| 1876
1882

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} John T. Morgan (Democratic)
{{dm|date=February 2020}}

}}

Arkansas

| James H. Berry

| {{Party shading/Democratic}} | Democratic

| 1885 United States Senate special election in Arkansas

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} James H. Berry (Democratic)
{{dm|date=February 2020}}

}}

Colorado

| Thomas M. Bowen

| {{Party shading/Republican}} | Republican

| 1882–83

| {{Party shading/Republican/Hold}} | Incumbent retired or lost re-election.
New senator elected in 1889.
Republican hold.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Edward O. Wolcott (Republican)
{{dm|date=February 2020}}

}}

Delaware

| Eli Saulsbury

| {{Party shading/Democratic}} | Democratic

| 1870
1876
1883

| {{Party shading/Republican}} | Incumbent lost re-election.
New senator elected in 1888 or 1889.
Republican gain.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Anthony C. Higgins (Republican)
{{Party stripe|Democratic Party (US)}}Eli Saulsbury (Democratic)
{{dm|date=February 2020}}

}}

Georgia

| Alfred H. Colquitt

| {{Party shading/Democratic}} | Democratic

| 1883

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} Alfred H. Colquitt (Democratic)
{{dm|date=February 2020}}

}}

Illinois

| Shelby M. Cullom

| {{Party shading/Republican}} | Republican

| 1882

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Shelby M. Cullom (Republican)
{{dm|date=February 2020}}

}}

Iowa

| James F. Wilson

| {{Party shading/Republican}} | Republican

| 1882

| Incumbent re-elected January 25, 1888.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} James F. Wilson (Republican){{sfn | Clark | page=214}}
{{Party stripe|Democratic Party (US)}}Thomas J. Anderson (Democratic)
{{Party stripe|Unknown}}Daniel Campbell (Unknown){{efn | name=Clark215 | Campbell, Reed, Hull, and Wallace each received between one and three votes.{{sfn | Clark | page=215}}}}
{{Party stripe|Unknown}}J. R. Reed (Unknown){{efn | name=Clark215}}
{{Party stripe|Republican Party (US)}}John A. T. Hull (Republican){{efn | name=Clark215}}
{{Party stripe|Republican Party (US)}}Henry C. Wallace (Republican){{efn | name=Clark215}}

}}

Kansas

| Preston B. Plumb

| {{Party shading/Republican}} | Republican

| 1877
1883

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Preston B. Plumb (Republican)
{{dm|date=February 2020}}

}}

Kentucky

| James B. Beck

| {{Party shading/Democratic}} | Democratic

| 1876
1882

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} James B. Beck (Democratic)
{{dm|date=February 2020}}

}}

Louisiana

| Randall L. Gibson

| {{Party shading/Democratic}} | Democratic

| 1882

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} Randall L. Gibson (Democratic)
{{dm|date=February 2020}}

}}

Maine

| William P. Frye

| {{Party shading/Republican}} | Republican

| nowrap | 1881 United States Senate special election in Maine
1883

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} William P. Frye (Republican)
{{dm|date=February 2020}}

}}

Massachusetts

| George F. Hoar

| {{Party shading/Republican}} | Republican

| 1877
1883

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} George F. Hoar (Republican)
{{dm|date=February 2020}}

}}

Michigan

| Thomas W. Palmer

| {{Party shading/Republican}} | Republican

| 1882–83

| {{Party shading/Republican/Hold}} | Incumbent retired.
New senator elected in 1889.
Republican hold.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} James McMillan (Republican)
{{dm|date=February 2020}}

}}

Minnesota

| Dwight M. Sabin

| {{Party shading/Republican}} | Republican

| 1883

| {{Party shading/Republican/Hold}} | Incumbent lost renomination.
New senator elected in 1888.
Republican hold.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} W. D. Washburn (Republican)
{{dm|date=February 2020}}

}}

Mississippi

| Edward C. Walthall

| {{Party shading/Democratic}} | Democratic

| 1885 {{Small|(appointed)}}
1886 United States Senate special election in Mississippi

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} Edward C. Walthall (Democratic)
{{dm|date=February 2020}}

}}

Nebraska

| Charles F. Manderson

| {{Party shading/Republican}} | Republican

| 1883

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Charles F. Manderson (Republican)
{{dm|date=February 2020}}

}}

New Hampshire

| William E. Chandler

| {{Party shading/Republican}} | Republican

| 1887 United States Senate special election in New Hampshire

| {{Party shading/Loss}} | Unknown if incumbent retired or lost re-election.
Legislature failed to elect.
Republican loss.
Gilman Marston (R) was appointed to start the next term and Chandler was later elected to finish the term; see below.

| {{dm|date=February 2020}}

New Jersey

| John R. McPherson

| {{Party shading/Democratic}} | Democratic

| 1877
1883

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} John R. McPherson (Democratic) 43
{{Party stripe|Republican Party (US)}} William J. Sewell (Republican) 38

}}

North Carolina

| Matt W. Ransom

| {{Party shading/Democratic}} | Democratic

| 1872 United States Senate special election in North Carolina
1876
1883

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} Matt W. Ransom (Democratic)
{{dm|date=February 2020}}

}}

Oregon

| Joseph N. Dolph

| {{Party shading/Republican}} | Republican

| 1882

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Joseph N. Dolph (Republican)
{{dm|date=February 2020}}

}}

Rhode Island

| Jonathan Chace

| {{Party shading/Republican}} | Republican

| 1885 United States Senate special election in Rhode Island

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Jonathan Chace (Republican)
{{dm|date=February 2020}}

}}

South Carolina

| Matthew Butler

| {{Party shading/Democratic}} | Democratic

| 1876
1882

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} Matthew Butler (Democratic)
{{dm|date=February 2020}}

}}

Tennessee

| Isham G. Harris

| {{Party shading/Democratic}} | Democratic

| 1877
1883

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} Isham G. Harris (Democratic)
{{dm|date=February 2020}}

}}

Texas

| Richard Coke

| {{Party shading/Democratic}} | Democratic

| 1876
1882

| Incumbent re-elected in 1888.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} Richard Coke (Democratic)
{{dm|date=February 2020}}

}}

Virginia

| Harrison H. Riddleberger

| {{Party shading/Readjuster}} | {{white|Readjuster}}

| 1881

| {{party shading/Democratic}} | Incumbent retired.
New senator elected early December 20, 1887.[http://www.encyclopediavirginia.org/Barbour_John_S_1820-1892 John S. Barbour Jr.] at Encyclopedia Virginia
Democratic gain.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} John S. Barbour Jr. (Democratic)
{{dm|date=February 2020}}

}}

West Virginia

| John E. Kenna

| {{Party shading/Democratic}} | Democratic

| 1883

| Incumbent re-elected in 1889.

| nowrap | {{Plainlist |

{{Party stripe|Democratic Party (US)}}{{Aye}} John E. Kenna (Democratic)
{{dm|date=February 2020}}

}}

= Elections during the 51st Congress =

In these elections, the winners were elected in 1889 after March 4; ordered by election date.

class=wikitable
valign=bottom ! rowspan=2 \| State ! colspan=3 \| Incumbent ! rowspan=2 \| Results ! rowspan=2 \| Candidates
valign=bottom ! Senator ! Party ! Electoral history
Rhode Island (Class 2) \| Jonathan Chace \| {{Party shading/Republican}} \| Republican \| 1885 United States Senate special election in Rhode Island 1888 \| {{Party shading/Republican/Hold}} \| Incumbent resigned April 9, 1889. New senator elected April 10, 1889. Republican hold. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Nathan F. Dixon III (Republican) {{dm\|date=February 2020}} }}
New Hampshire (Class 2) \| Gilman Marston \| {{Party shading/Republican}} \| Republican \| 1889 {{Small\|(Appointed)}} \| {{Party shading/Republican/Hold}} \| Interim appointee retired or lost election to finish the term. New senator elected June 18, 1889. Republican hold. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} William E. Chandler (Republican) {{dm\|date=February 2020}} }}
South Dakota (Class 2) \| colspan=3 rowspan=2 \| None (new state) \| {{Party shading/Republican}} \| South Dakota admitted to the Union November 2, 1889. First senators elected October 16, 1889, in advance of statehood.Journal of the House of Representatives…, p. 11 Republican gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Richard F. Pettigrew (Republican) 108 {{Party stripe\|Democratic Party (US)}}Bartlett Tripp (Democratic) 14 Absent/not voting 2 }}
South Dakota (Class 3) \| {{Party shading/Republican}} \| South Dakota admitted to the Union November 2, 1889. First senators elected October 16, 1889, in advance of statehood. Republican gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Gideon C. Moody (Republican) 107 {{Party stripe\|Democratic Party (US)}}Merritt H. Day (Democratic) 14 }}
Washington (Class 1) \| colspan=3 rowspan=2 \| None (new state) \| {{Party shading/Republican}} \| Washington admitted to the Union November 11, 1889. First senators elected November 20, 1889. Republican gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} John B. Allen (Republican) {{dm\|date=February 2020}} }}
Washington (Class 3) \| {{Party shading/Republican}} \| Washington admitted to the Union November 11, 1889. First senators elected November 20, 1889. Republican gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Watson C. Squire (Republican) {{dm\|date=February 2020}} }}
North Dakota (Class 1) \| colspan=3 rowspan=2 \| None (new state) \| {{Party shading/Republican}} \| North Dakota admitted to the Union November 2, 1889. First senators elected November 25, 1889.Journal of the House of the First Legislative Assembly…, p. 63-64 Republican gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Lyman R. Casey (Republican) 62 {{Party stripe\|Republican Party (US)}}Martin N. Johnson (Republican) 26 {{Party stripe\|Democratic Party (US)}}Daniel W. Maratta (Democratic) 4 }}
North Dakota (Class 3) \| {{Party shading/Republican}} \| North Dakota admitted to the Union November 2, 1889. First senators elected November 25, 1889. Republican gain. \| nowrap \| {{Plainlist \| {{Party stripe\|Republican Party (US)}}{{Aye}} Gilbert A. Pierce (Republican) 56 {{Party stripe\|Democratic Party (US)}}Michael L. McCormack (Democratic) 6 }}

class=wikitable

valign=bottom

! rowspan=2 | State

! colspan=3 | Incumbent

! rowspan=2 | Results

! rowspan=2 | Candidates

valign=bottom

! Senator

! Party

! Electoral history

Rhode Island
(Class 2)

| Jonathan Chace

| {{Party shading/Republican}} | Republican

| 1885 United States Senate special election in Rhode Island
1888

| {{Party shading/Republican/Hold}} | Incumbent resigned April 9, 1889.
New senator elected April 10, 1889.
Republican hold.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Nathan F. Dixon III (Republican)
{{dm|date=February 2020}}

}}

New Hampshire
(Class 2)

| Gilman Marston

| {{Party shading/Republican}} | Republican

| 1889 {{Small|(Appointed)}}

| {{Party shading/Republican/Hold}} | Interim appointee retired or lost election to finish the term.
New senator elected June 18, 1889.
Republican hold.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} William E. Chandler (Republican)
{{dm|date=February 2020}}

}}

South Dakota
(Class 2)

| colspan=3 rowspan=2 | None (new state)

| {{Party shading/Republican}} | South Dakota admitted to the Union November 2, 1889.
First senators elected October 16, 1889, in advance of statehood.Journal of the House of Representatives…, p. 11
Republican gain.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Richard F. Pettigrew (Republican) 108
{{Party stripe|Democratic Party (US)}}Bartlett Tripp (Democratic) 14
Absent/not voting 2

}}

South Dakota
(Class 3)

| {{Party shading/Republican}} | South Dakota admitted to the Union November 2, 1889.
First senators elected October 16, 1889, in advance of statehood.
Republican gain.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Gideon C. Moody (Republican) 107
{{Party stripe|Democratic Party (US)}}Merritt H. Day (Democratic) 14

}}

Washington
(Class 1)

| colspan=3 rowspan=2 | None (new state)

| {{Party shading/Republican}} | Washington admitted to the Union November 11, 1889.
First senators elected November 20, 1889.
Republican gain.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} John B. Allen (Republican)
{{dm|date=February 2020}}

}}

Washington
(Class 3)

| {{Party shading/Republican}} | Washington admitted to the Union November 11, 1889.
First senators elected November 20, 1889.
Republican gain.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Watson C. Squire (Republican)
{{dm|date=February 2020}}

}}

North Dakota
(Class 1)

| colspan=3 rowspan=2 | None (new state)

| {{Party shading/Republican}} | North Dakota admitted to the Union November 2, 1889.
First senators elected November 25, 1889.Journal of the House of the First Legislative Assembly…, p. 63-64
Republican gain.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Lyman R. Casey (Republican) 62
{{Party stripe|Republican Party (US)}}Martin N. Johnson (Republican) 26
{{Party stripe|Democratic Party (US)}}Daniel W. Maratta (Democratic) 4

}}

North Dakota
(Class 3)

| {{Party shading/Republican}} | North Dakota admitted to the Union November 2, 1889.
First senators elected November 25, 1889.
Republican gain.

| nowrap | {{Plainlist |

{{Party stripe|Republican Party (US)}}{{Aye}} Gilbert A. Pierce (Republican) 56
{{Party stripe|Democratic Party (US)}}Michael L. McCormack (Democratic) 6

}}

References

[https://www.senate.gov/pagelayout/history/one_item_and_teasers/partydiv.htm Party Division in the Senate, 1789-Present], via Senate.gov
{{cite book | first=Dan Elbert | last=Clark | url=https://archive.org/details/historyofsenator00clar | title=History of Senatorial Elections in Iowa | publisher=State Historical Society of Iowa | location=Iowa City, Iowa | date=1912 | ref = {{sfnRef | Clark}}}}
{{cite book | title = Journal of the House of the First Legislative Assembly begun and held at the Capitol at Bismarck, November 19, 1889 to March 18, 1890 | publisher=Tribune, Printers and Binders | date=1890 | url= https://books.google.com/books?id=94mLUzgik_4C}}
{{cite book | url= https://books.google.com/books?id=TwobAQAAIAAJ | title=Journal of the House of Representatives of the Special Session of the South Dakota Legislature. | publisher=Free Press Company | date= 1889 }}

1888–89 United States Senate elections#New Hampshire

Results summary

Change in Senate composition

= Before the elections =

= After the elections =

= Beginning of the next Congress =

= End of 1889 =

Race summaries

= Special elections during the 50th Congress =

= Races leading to the 51st Congress =

= Elections during the 51st Congress =

See also

References