California's 20th senatorial district

| Recall

| align="right" {{na}} No 64.8 – 35.2%

| President

| align="right" {{party shading/Democratic}} | Biden 65.2 – 32.5%

| Governor

| align="right" {{party shading/Democratic}} | Newsom 65.7 – 34.3%

| align="right" {{party shading/Democratic}} | Feinstein 52.9 – 47.1%

| President

| align="right" {{party shading/Democratic}} | Clinton 67.9 – 26.8%

| align="right" {{party shading/Democratic}} | Harris 50.6 – 49.4%

| Governor

| align="right" {{party shading/Democratic}} | Brown 61.7 – 38.3%

| President

| align="right" {{party shading/Democratic}} | Obama 68.2 – 29.8%

| align="right" {{party shading/Democratic}} | Feinstein 68.8 – 31.2%

| {{party shading/Democratic}} |Democratic

| April 16, 1852 –
May 15, 1854

|Elected in 1851.
Re-elected in 1852.
{{data missing|date=May 2023}}

|rowspan=7|Sierra

| {{party shading/Whig}} |Whig

| January 1, 1855 –
April 21, 1856

|Elected in 1854.
{{data missing|date=May 2023}}

| {{party shading/American}} |Know Nothing

| rowspan=2|January 5, 1857 –
April 26, 1858

|rowspan=2|Elected in 1856.
Re-elected in 1857.
{{data missing|date=May 2023}}

| {{party shading/Democratic}} |Democratic

|January 3, 1859 –
April 13, 1860

|Elected in 1858.
Re-elected in 1859.
{{data missing|date=May 2023}}

| {{party shading/Southern Democratic}}|Beckenridge
Democratic

|January 7, 1861 –
June 19, 1861

|Elected in 1860.
Resigned.

|June 19, 1861 –
September 4, 1861

|Vacant seat redistricted to the
22nd district before special election.

! rowspan=2 | Years

! rowspan=20 |  

! colspan=3 | Seat A

! rowspan=20 |  

! colspan=3 | Seat B

! rowspan=20 |  

!rowspan=2|Counties represented

! Member

! Party

! Electoral history

! Member

! Party

! Electoral history

| nowrap | January 7, 1861 –
May 15, 1862

| rowspan=2 align=left |
William D. Harriman
{{small|(Dutch Flat)}}

| {{party shading/Republican}} |Republican

| rowspan=2|Elected in 1861.
Re-elected in 1862.
Retired.

| align=left |
Philip W. Thomas
{{small|(Auburn)}}

|{{party shading/Democratic}}|Union
Democratic

| Redistricted from the 17th district and
re-elected in 1861.
{{data missing|date=May 2023}}

|rowspan=4|Placer

|{{party shading/National Union}}|Union

| align=left |
Felix B. Higgins
{{small|(Auburn)}}

|{{party shading/National Union}}|Union

| Elected in 1862.
{{data missing|date=May 2023}}

| rowspan=2 align=left | 100px
James E. Hale
{{small|(Auburn)}}

|rowspan=2 {{party shading/National Union}}|Union

| rowspan=2|Elected in 1862.
Re-elected in 1865.
{{data missing|date=May 2023}}

| rowspan=2 align=left |
John Yule
{{small|(Colfax)}}

|rowspan=2 {{party shading/National Union}}|Union

| rowspan=2|Elected in 1862.
Re-elected in 1865.
{{data missing|date=May 2023}}

|{{party shading/National Union}}|Union

| December 2, 1867 –
April 4, 1870

|Elected in 1867.
{{data missing|date=May 2023}}

|rowspan=3|Placer

|April 4, 1870 –
December 4, 1871

| {{party shading/Republican}} |Republican

| December 4, 1871 –
April 1, 1872

|Elected in 1871.
{{data missing|date=May 2023}}

| {{party shading/Independent}} |Independent

| December 1, 1873 –
April 3, 1876

|Elected in 1873.
{{data missing|date=May 2023}}

|Placer, El Dorado County, California

! rowspan=2 | Years

! rowspan=20 |  

! colspan=3 | Seat A

! rowspan=20 |  

! colspan=3 | Seat B

! rowspan=20 |  

!rowspan=2|Counties represented

! Member

! Party

! Electoral history

! Member

! Party

! Electoral history

| nowrap | December 6, 1875 –
April 3, 1876

|align=left|100px
Samuel G. Hilborn
{{small|(Vallejo)}}

| {{party shading/Republican}} |Republican

|Elected in 1875.
Redistricted to the 19th district.

|rowspan=2 align=left|100px
William M. Hill
{{small|(Sonoma)}}

| rowspan=2 {{party shading/Democratic}} |Democratic

|rowspan=2 | Elected in 1875.
{{data missing|date=May 2023}}

|rowspan=2|Solano, Sonoma

| colspan="2" |Vacant

|Seat vacant due to Hillborn
winning a seat for the 19th district.

| {{party shading/Democratic}} |Democratic

| January 5, 1880 –
January 8, 1883

|Elected in 1879.
Re-elected in 1880.
{{data missing|date=May 2023}}

|rowspan=2|Lake, Napa, Sonoma

| {{party shading/Democratic}} |Democratic

| January 8, 1883 –
January 3, 1887

|Elected in 1882.
Re-elected in 1884.
{{data missing|date=May 2023}}

| {{party shading/Democratic}} |Democratic

| January 3, 1887 –
January 5, 1891

|Elected in 1886.
Re-elected in 1888.
{{data missing|date=May 2023}}

| rowspan="13" |San Francisco

| {{party shading/Republican}} |Republican

| January 5, 1891 –
January 2, 1893

|Elected in 1890.
Redistricted to the 24th district.

| {{party shading/Republican}} |Republican

| January 2, 1893 –
January 7, 1895

|Redistricted from the 26th district and re-elected in 1892.
{{data missing|date=June 2023}}

| {{party shading/Republican}} |Republican

| January 7, 1895 –
January 2, 1899

|Elected in 1894.
{{data missing|date=May 2023}}

| {{party shading/Republican}} |Republican

| January 2, 1899 –
January 5, 1903

|Elected in 1898.
{{data missing|date=May 2023}}

| {{party shading/Republican}} |Republican

| January 5, 1903 –
February 27, 1905

| Elected in 1902.
Expelled for accepting bribes.{{cite web|title=FOUR SENATORS ARE VOTED OUT OF OFFICE The Bribe Takers Are Expelled by a Unanimous Vote-Wright Attempts to Thwart Movement at Last Moment.|url=https://cdnc.ucr.edu/?a=d&d=MDA19050228&dliv=userclipping&cliparea=1.1%2C1376%2C680%2C1369%2C3216&factor=4&e=25-02-1905-30-03-1905-190-en--20--1-byDA-txt-txIN-Senator+Frank+French+----1905---1|website=cdnc.ucr.edu}}

|February 27, 1905 –
January 7, 1907

|

| {{party shading/Democratic}} |Democratic

| January 7, 1907 –
January 2, 1911

|Elected in 1906.
Lost re-election.

| {{party shading/Republican}} |Republican

| January 2, 1911 –
January 4, 1915

|Elected in 1910.
Retired to become San Francisco Tax Collector.

| {{party shading/Bull Moose}} |Progressive

| rowspan=2|January 4, 1915 –
January 8, 1923

|rowspan=2|Elected in 1914.
Re-elected in 1918.
Retired to become a member of the San Francisco Board of Supervisors.

| {{party shading/Republican}} |Republican

| January 8, 1923 –
April 23, 1930

|Elected in 1922.
Re-elected in 1926.
Died.{{cite web|title=Services Today for Senator Gray|url=https://cdnc.ucr.edu/?a=d&d=DNLA19300424.1.26&srpos=9&e=------193-en--20--1-byDA-txt-txIN-Senator+Patrick+Gray----1930---1|website=cdnc.ucr.edu}}

|April 23, 1930 –
January 5, 1931

|

| {{party shading/Republican}} |Republican

| January 5, 1931 –
January 8, 1951

|Elected in 1930.
Re-elected in 1934.
Re-elected in 1934.
Re-elected in 1938.
Re-elected in 1942.
Re-elected in 1946.
{{data missing|date=May 2023}}

| rowspan="3" |San Joaquin

| {{party shading/Republican}} |Republican

| January 8, 1951 –
January 3, 1955

|Elected in 1950.
Re-elected in 1954.
Retired to run for State Assembly.

| {{party shading/Democratic}} |Democratic

| January 3, 1955 –
January 2, 1967

|Elected in 1954.
Re-elected in 1958.
Re-elected in 1962.
Redistricted to the 6th district.

| {{party shading/Republican}} |Republican

| January 2, 1967 –
October 19, 1973

| Elected in 1966.
Re-elected in 1970.
Resigned.

| rowspan="3"|San Bernardino

|October 19, 1973 –
January 23, 1974

|

| {{party shading/Democratic}} |Democratic

| January 23, 1974 –
November 30, 1974

|Elected to finish Coombs's term.
Redistricted to the California's 32nd State Senate district.

| {{party shading/Democratic}} |Democratic

| December 2, 1974 –
November 19, 1991

| Elected in 1974.
Re-elected in 1978.
Re-elected in 1982.
Re-elected in 1986.
Re-elected in 1990.
Resigned after being indicted due to the BRISPEC sting operation.{{cite web|url=https://www.latimes.com/archives/la-xpm-1991-11-20-mn-183-story.html|title=Robbins Quits Senate, Admits to Corruption : Probe: The San Fernando Valley Democrat will be sentenced to 5 years in prison. He promises to cooperate in other prosecutions.|date=November 20, 1991|author=Jacobs, Paul|website=Los Angeles Times}}

| rowspan="6" |Los Angeles

|November 19, 1991 –
July 2, 1992

|

| {{party shading/Democratic}} |Democratic

| July 2, 1992 –
November 30, 1994

|Resigned from the 23rd district and assumed seat to finish Robbins's term.
Retired due to term limits.

| {{party shading/Democratic}} |Democratic

| December 5, 1994 –
November 30, 1998

|Redistricted from the 22nd district and re-elected in 1994.
Retired due to term limits.

| {{party shading/Democratic}} |Democratic

| December 7, 1998 –
November 30, 2006

|Elected in 1998.
Re-elected in 2002.
Retired to run for State Assembly.

| {{party shading/Democratic}} |Democratic

| December 4, 2006 –
November 30, 2014

|Elected in 2006.
Re-elected in 2010.
Retired to run for Secretary of State.

| {{party shading/Democratic}} |Democratic

| December 1, 2014 –
December 5, 2022

|Elected in 2014.
Re-elected in 2018.
Retired to run for San Bernardino County Supervisor.

|Los Angeles, San Bernardino

| {{party shading/Democratic}} |Democratic

| December 5, 2022 –
present

|Elected in 2022.

|Los Angeles