Note: ridership does not mean unique passengers, it means total number of trips.
class="wikitable sortable sort-under-center col5right col6right col8right"
!
! System
! Transit agency
! City/area served
! Annual ridership {{American transit ridership|annualdate}} {{American transit ridership|annualcitation}}
! Avg. ridership {{American transit ridership|dailydate}} {{American transit ridership|dailycitation}}
! data-sort-type="number" | System length
! data-sort-type="number" | Avg. boardings per mile {{American transit ridership|dailydate}}
! Opened
! data-sort-type="number" | Stations
! data-sort-type="number" | Lines |
1
| New York City Subway
| NYCTA[Agency is a subsidiary of the Metropolitan Transportation Authority.]
| New York City
| {{American transit ridership|NY MTA NYCT HR annual}}
| {{American transit ridership|NY MTA NYCT HR daily}}
| {{cvt|248|mi|km|sortable=on}}[{{cite web |url=http://web.mta.info/mta/investor/pdf/2019/2018_CAFR_Final.pdf |title=Comprehensive Annual Financial Report for the Years Ended December 31, 2018 and 2017 |publisher=Metropolitan Transportation Authority (MTA) |page=156 |date=June 26, 2019 |access-date=January 15, 2021}}]
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|NY MTA NYCT HR daily}} |R}} / 248}} }}
| 1904
| {{NYCS const|number|total}}[{{cite web |url=http://web.mta.info/mta/network.htm#statsnyct |title=The MTA Network - New York City Transit at a Glance |publisher=Metropolitan Transportation Authority (MTA) |access-date=August 29, 2014}}]
| 26 |
2
| Washington Metro
| WMATA
| Washington metropolitan area
| {{American transit ridership|DC Washington Metro HR annual}}
| {{American transit ridership|DC Washington Metro HR daily}}
| {{cvt|129|mi|km|sortable=on}}
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|DC Washington Metro HR daily}} |R}} / 129}} }}
| 1976[{{cite web |url=http://www.wmata.com/about_metro/ |title=About Metro |publisher=Washington Metropolitan Area Transit Authority |year=2014 |access-date=August 28, 2014 |archive-date=December 2, 2016 |archive-url=https://web.archive.org/web/20161202204655/http://www.wmata.com/about_metro/ |url-status=dead }}]
| 98
| 6 |
3
| Chicago "L"
| CTA
| Chicago
| {{American transit ridership|IL Chicago CTA HR annual}}
| {{American transit ridership|IL Chicago CTA HR daily}}
| {{cvt|102.8|mi|km|sortable=on}}
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|IL Chicago CTA HR daily}} |R}} / 102.8}} }}
| 1892
| 146[{{cite web |url=http://www.transitchicago.com/about/facts.aspx |title=Facts at a Glance |publisher=Chicago Transit Authority |access-date=May 17, 2013}}]
| 8 |
4
| MBTA subway ("the T")[System also includes the Green Line and Mattapan Line light rail lines; ridership data for these light rail lines is not included in statistics shown here.] {{small|(Blue, Orange, and Red lines)}}
| MBTA
| Boston
| {{American transit ridership|MA Boston HR annual}}
| {{American transit ridership|MA Boston HR daily}}
| {{cvt|38|mi|km|sortable=on}}[{{cite web|url=http://www.mbta.com/uploadedfiles/documents/2014%20BLUEBOOK%2014th%20Edition.pdf |title=Ridership and Service Statistics, Fourteenth Edition 2014 |publisher=Massachusetts Bay Transportation Authority |format=pdf |pages=3–4, 6 |date=July 2014 |access-date=August 31, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20140912053503/http://www.mbta.com/uploadedfiles/documents/2014%20BLUEBOOK%2014th%20Edition.pdf |archive-date=September 12, 2014 }}]
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|MA Boston HR daily}} |R}} / 38}} }}
| 1901
| 53
| 3 |
5
| PATH
| PANYNJ
| Manhattan, Hudson County, Newark
| {{American transit ridership|NJ Port Authority NY NJ HR annual}}
| {{American transit ridership|NJ Port Authority NY NJ HR daily}}
| {{cvt|13.8|mi|km|sortable=on}}[{{cite web |url=http://www.panynj.gov/about/pdf/2008-GHG-Inventory-Summary.pdf |title=Greenhouse Gas (GHG) and Criteria Air Pollutant (CAP) Emission Inventory (EI) for the Port Authority of New York & New Jersey: 2008 Summary and 2006-2008 Trends |publisher=PATH |format=pdf |page=4 |date=June 2010 |access-date=September 27, 2012 |archive-date=February 10, 2017 |archive-url=https://web.archive.org/web/20170210050002/https://www.panynj.gov/about/pdf/2008-GHG-Inventory-Summary.pdf |url-status=dead }}][{{cite web |url=http://www.panynj.gov/path/facts-info.html |title=Facts & Info - PATH - The Port Authority of NY & NJ |publisher=PATH |year=2013 |access-date=July 18, 2013 |archive-date=November 29, 2019 |archive-url=https://web.archive.org/web/20191129234922/http://www.panynj.gov/path/facts-info.html |url-status=dead }}]
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|NJ Port Authority NY NJ HR daily}} |R}} / 13.8}} }}
| 1908[{{cite web |url=http://www.panynj.gov/path/history.html |title=History |publisher=PATH |access-date=June 6, 2012}}]
| 13
| 4[{{cite web |url=http://www.panynj.gov/path/maps-schedules.html |title=Maps & Schedule |publisher=PATH |access-date=June 6, 2012 |archive-date=December 3, 2012 |archive-url=https://web.archive.org/web/20121203072937/http://www.panynj.gov/path/maps-schedules.html |url-status=dead }}] |
6
| SEPTA Metro[System also includes light rail lines. Ridership data for such lines is not included in statistics given.] {{small|(L, B, and M)}}
| SEPTA
| Philadelphia
| {{American transit ridership|PA Philadelphia HR annual}}
| {{American transit ridership|PA Philadelphia HR daily}}
| {{cvt|36.7|mi|km|sortable=on}}[{{cite web|url=http://www.septa.org/reports/pdf/route-statistics.pdf |title=SEPTA Route Statistics 2014 |publisher=Southeastern Pennsylvania Transportation Authority (SEPTA) Service Planning Department |format=pdf |pages=9, 13, 221 |date=Spring 2014 |access-date=August 31, 2014 |url-status=dead |archive-url=https://web.archive.org/web/20130524014002/http://www.septa.org/reports/pdf/route-statistics.pdf |archive-date=May 24, 2013 }}][{{cite web |url=http://www.septa.org/media/guide/pdf/media-guide.pdf |title=Media Guide |publisher=SEPTA |format=pdf |pages=7, 11 |year=2013 |access-date=August 31, 2014}}]
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|PA Philadelphia HR daily}} |R}} / 36.7}} }}
| 1907[{{cite web |url=http://www.septa.org/media/releases/2009/09-11.html |title=SEPTA 'Elebrates' End Of Project |publisher=SEPTA |date=September 11, 2009}}]
| 75[{{cite web |url=http://www.septa.org/reports/pdf/opfacts.pdf |title=SEPTA Operating Facts Fiscal Year 2013 |publisher=SEPTA |format=pdf |pages=4–6 |date=June 30, 2013 |access-date=August 31, 2014}}]
| 3 |
7
| Bay Area Rapid Transit (BART)[Figures only include BART's five rapid transit lines, and not the system's AGT line to Oakland Airport nor the eBART line.]
| BART
| San Francisco Bay Area
| {{American transit ridership|CA San Francisco BART HR annual}}
| {{American transit ridership|CA San Francisco BART HR daily}}
| {{cvt|131.4|mi|km|sortable=on}}
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|CA San Francisco BART HR daily}} |R}} / 119.1}} }}
| 1972[{{cite web |url=http://www.bart.gov/news/articles/2009/news20090911.aspx |title=Rider recalls first day of BART passenger service on Sept. 11, 1972 |publisher=Bay Area Rapid Transit |date=September 11, 2009 |access-date=June 19, 2012}}]
| 50[{{cite web |url=http://www.bart.gov/about/history/facts |title=System Facts |publisher=Bay Area Rapid Transit |access-date=January 19, 2023}}]
| 7[{{cite web |url=https://www.bart.gov/schedules |title=BART - Schedules By Line |publisher=Bay Area Rapid Transit |year=2019 |access-date=March 3, 2019}}] |
8
| MARTA rail
| MARTA
| Atlanta
| {{American transit ridership|GA Atlanta MARTA HR annual}}
| {{American transit ridership|GA Atlanta MARTA HR daily}}
| {{cvt|47.6|mi|km|sortable=on}}
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|GA Atlanta MARTA HR daily}} |R}} / 47.6}} }}
| 1979[{{cite web |url=http://www.itsmarta.com/marta-past-and-future.aspx |title=About MARTA: MARTA's Past & Future |publisher=Metropolitan Atlanta Rapid Transit Authority |access-date=June 24, 2012}}]
| 38[{{cite press release |url=http://us.bombardier.com/us/press_release_17042012.htm |title=Bombardier Partners with Atlanta to Improve Track Worker Protection with TrackSafe Technology |publisher=Bombardier |date=April 17, 2012 |access-date=June 24, 2012}}]
| 4 |
9
| Metro Rail {{small|(B and D lines)}}
| LACMTA
| Los Angeles
| {{formatnum: {{#expr: {{American transit ridership|CA Los Angeles Metro HR annual}} }} }}
| {{formatnum: {{#expr: {{American transit ridership|CA Los Angeles Metro HR daily}} }} }}
| {{cvt|17.4|mi|km|sortable=on}}[{{citation |url=http://www.metro.net/projects_studies/westside/images/Chapter%201-Purpose%20&%20Need.pdf |title=Westside Transit Corridor Extension Study: Final Alternatives Analysis Study|chapter=Chapter 1.0 - Purpose and Need |publisher=Los Angeles County Metropolitan Transportation Authority |format=pdf |pages=1–18 |date=January 2009 |access-date=September 28, 2012}}]
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|CA Los Angeles Metro HR daily}} |R}} / 17.4}} }}
| 1993
| 16
| 2 |
10
| Metrorail
| Miami-Dade Transit
| Miami
| {{American transit ridership|FL Miami HR annual}}
| {{American transit ridership|FL Miami HR daily}}
| {{cvt|24.4|mi|km|sortable=on}}
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|FL Miami HR daily}} |R}} / 24.4}} }}
| 1984[{{cite web |url=http://www.miamidade.gov/transit/history.asp|title=Miami-Dade Transit History |publisher=Miami-Dade County |access-date=June 26, 2012}}]
| 23[{{cite web |url=http://www.miamidade.gov/transit/metrorail.asp |title=Metrorail |publisher=Miami-Dade County |access-date=August 27, 2012}}]
| 2 |
11
| PATCO Speedline
| PATCO
| Philadelphia, Camden County
| {{American transit ridership|NJ PATCO annual}}
| {{American transit ridership|NJ PATCO daily}}
| {{cvt|14.2|mi|km|sortable=on}}
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|NJ PATCO daily}} |R}} / 14.2}} }}
| 1936[{{cite web |url=http://www.ridepatco.org/about/history.html |title=A History of Commitment |publisher=Port Authority Transit Corporation |access-date=June 6, 2012}}]
| 13
| 1 |
12
| Baltimore Metro SubwayLink
| MTA
| Baltimore
| {{American transit ridership|MD Baltimore HR annual}}
| {{Round| {{#expr: {{formatnum: {{American transit ridership|MD Baltimore HR annual}} |R}} / 365 }} |
2}}[This is the Average Daily Ridership not Average Weekday Ridership.]
| {{cvt|15.5|mi|km|sortable=on}}[{{cite web |url=http://mta.maryland.gov/metro-subway |title=Metro Subway |publisher=Maryland Transportation Authority |access-date=September 28, 2012}}]
| {{Round| {{#Expr: {{#expr: {{formatnum: {{American transit ridership|MD Baltimore HR annual}} |R}} / 365 }} / 15.5}} }}
| 1983[{{cite web |url=http://mta.maryland.gov/sites/default/files/Media_Guide_2010.pdf |title=2010-2011 MTA Media Guide |publisher=Maryland Transportation Authority |format=pdf |access-date=September 28, 2012}}]
| 14
| 1 |
13
| Staten Island Railway
| SIRTOA
| Staten Island
| {{American transit ridership|NY MTA SIRR annual}}
| {{American transit ridership|NY MTA SIRR daily}}
| {{cvt|14|mi|km|sortable=on}}
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|NY MTA SIRR daily}} |R}} / 14}} }}
| 1860[{{cite news |url=http://cityroom.blogs.nytimes.com/2008/12/26/staten-island-rail-car-derails-in-tottenville/ |title=Staten Island Rail Car Derails in Tottenville |first1=Sewell |last1=Chan |first2=Nate |last2=Schweber |newspaper=The New York Times |date=December 26, 2008 |access-date=September 28, 2012}}]
| 21
| 1 |
14
| Tren Urbano
| ATI
| San Juan
| {{American transit ridership|PR San Juan HR annual}}
| {{American transit ridership|PR San Juan HR daily}}
| {{cvt|10.7|mi|km|sortable=on}}[{{cite web |url=https://www.fhwa.dot.gov/ipd/project_profiles/pr_tren_urbano.aspx |title=Project Profiles: Tren Urbano |publisher=Federal Highway Administration |access-date=September 28, 2012}}]
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|PR San Juan HR daily}} |R}} / 10.7}} }}
| 2004
| 16
| 1 |
15
| RTA Rapid Transit {{small|(Red Line)}}
| GCRTA
| Cleveland
| {{American transit ridership|OH Cleveland HR annual}}
| {{American transit ridership|OH Cleveland HR daily}}
| {{cvt|19|mi|km|sortable=on}}[{{cite web | url = http://www.riderta.com/annual/2013#annual-report-tabs7 | title = 2013 Annual Report - RTA Facts | publisher = Greater Cleveland Regional Transit Authority | date = October 31, 2013 | access-date = September 5, 2014}}]
| {{Round| {{#Expr: {{formatnum: {{American transit ridership|OH Cleveland HR daily}} |R}} / 19}} }}
| 1955[{{cite web |url=http://www.riderta.com/ar_RTAhistory.asp |title=RTA History |publisher=Greater Cleveland Regional Transit Authority |access-date=September 28, 2012}}]
| 18
| 1 |
16
| Skyline
| Honolulu DTS
| Honolulu
| 614,800
| 3,700
| {{cvt|10.8|mi|km|sortable=on}}
| 343
| 2023[{{cite web |url=https://www.honolulu.gov/transportation/divisions/mobility/rail-operations.html|title=Skyline Rail Operations|publisher=Honolulu City Council |access-date=September 19, 2023}}]
| 9
| 1 |