
The 24 states above have no subway system and/or commuter light rail system in any city within the state. Some like Alaska, make sense given how small even their biggest cities are.
However, Indiana is the 17th most populous state in the country, and Indianapolis is the 16th-most populous city.
Here is a list of what each state has:

List of US Subway Systems
The data for the following list comes from here.
| System Name | City/area served | Estimated Annual Journeys | System Length | Opened | Number of Stations | Number of Lines |
|---|---|---|---|---|---|---|
| New York City Subway | New York City | 2,040,132,000 | 248 mi (399 km) | 1904 | 472 | 26 |
| Washington Metro | Washington metropolitan area | 166,654,000 | 129 mi (208 km) | 1976 | 98 | 6 |
| Chicago "L" | Chicago | 127,463,400 | 102.8 mi (165.4 km) | 1892 | 146 | 8 |
| MBTA subway | Boston | 84,251,600 | 38 mi (61 km) | 1901 | 53 | 3 |
| PATH | Manhattan, Hudson County, Newark | 62,489,400 | 13.8 mi (22.2 km) | 1908 | 13 | 4 |
| SEPTA Metro[ | Philadelphia | 59,009,800 | 36.7 mi (59.1 km) | 1907 | 75 | 3 |
| Bay Area Rapid Transit (BART) | San Francisco Bay Area | 49,075,000 | 131.4 mi (211.5 km) | 1972 | 50 | 7 |
| MARTA rail | Atlanta | 29,416,400 | 47.6 mi (76.6 km) | 1979 | 38 | 4 |
| Metro Rail | Los Angeles | 22,471,200 | 17.4 mi (28.0 km) | 1993 | 16 | 2 |
| Metrorail | Miami | 14,911,300 | 24.4 mi (39.3 km) | 1984 | 23 | 2 |
| PATCO Speedline | Philadelphia, Camden County | 5,640,600 | 14.2 mi (22.9 km) | 1936 | 13 | 1 |
| Baltimore Metro SubwayLink | Baltimore | 5,487,000 | 15.5 mi (24.9 km) | 1983 | 14 | 1 |
| Staten Island Railway | Staten Island | 4,743,000 | 14 mi (23 km) | 1860 | 21 | 1 |
| Tren Urbano | San Juan | 4,438,400 | 10.7 mi (17.2 km) | 2004 | 16 | 1 |
| RTA Rapid Transit | Cleveland | 3,151,500 | 19 mi (31 km) | 1955 | 18 | 1 |
| Skyline | Honolulu | 614,800 | 10.8 mi (17.4 km) | 2023 | 9 | 1 |
US Light Rail Systems
The list for light rail systems comes from here.
| System | City/areas served | Estimated Annual Journeys | System length | Opened | Stations | Lines |
|---|---|---|---|---|---|---|
| Metro Rail light rail | Los Angeles | 46,178,300 | 94.5 mi (152.1 km) | 1990 | 88 | 4 |
| San Diego Trolley | San Diego | 41,069,900 | 65 mi (105 km) | 1981 | 62 | 4 |
| MBTA light rail | Boston | 30,631,700 | 26 mi (42 km) | 1897 | 74 | 5 |
| Link | Seattle | 30,438,000 | 45.1 mi (72.6 km) | 2009 | 31 | 3 |
| Muni Metro | San Francisco | 29,361,800 | 35.7 mi (57.5 km) | 1912 | 152 | 9 |
| MAX Light Rail | Portland | 24,383,900 | 60 mi (97 km) | 1986 | 97 | 5 |
| DART | Dallas | 22,237,700 | 93 mi (150 km) | 1996 | 64 | 4 |
| HBLR, Newark Light Rail, River LINE | Jersey City, Newark, Camden-Trenton | 22,215,800 | 59.9 mi (96.4 km) | 1935 | 24 | 3 |
| METRO Light Rail | Minneapolis-St. Paul | 15,489,100 | 21.8 mi (35.1 km) | 2004 | 37 | 2 |
| SEPTA Metro | Philadelphia | 15,281,900 | 68.4 mi (110.1 km) | 1906 | >100 | 3 |
| TRAX (UTA) and S Line | Salt Lake City | 13,965,200 | 46.8 mi (75.3 km) | 1999 | 57 | 4 |
| METRORail | Houston | 13,456,400 | 23.8 mi (38.3 km) | 2004 | 44 | 3 |
| Denver RTD | Denver | 11,161,800 | 58.5 mi (94.1 km) | 1994 | 62 | 8 |
| Valley Metro Rail | Phoenix | 11,100,300 | 29.8 mi (48.0 km) | 2008 | 41 | 1 |
| MetroLink | St. Louis | 7,135,000 | 46 mi (74 km) | 1993 | 37 | 2 |
| SacRT light rail | Sacramento | 6,580,000 | 42.9 mi (69.0 km) | 1987 | 53 | 3 |
| CATS | Charlotte | 6,528,600 | 20.8 mi (33.5 km) | 2007 | 43 | 2 |
| Baltimore Light RailLink | Baltimore | 5,015,100 | 33 mi (53 km) | 1992 | 33 | 3 |
| VTA light rail | San Jose | 4,914,100 | 42.2 mi (67.9 km) | 1987 | 62 | 3 |
| RTA Streetcars | New Orleans | 3,535,600 | 26.9 mi (43.3 km) | 1835 | 5 | |
| Pittsburgh Light Rail | Pittsburgh | 3,236,100 | 26.2 mi (42.2 km) | 1984 | 53 | 3 |
| Portland Streetcar | Portland | 2,900,000 | 9.35 mi (15.05 km) | 2001 | 76 | 3 |
| Buffalo Metro Rail | Buffalo | 2,228,400 | 6.4 mi (10.3 km) | 1984 | 14 | 1 |
| SPRINTER | Oceanside | 1,893,900 | 22 mi (35 km) | 2008 | 15 | 1 |
| KC Streetcar | Kansas City | 1,856,129 | 2.2 mi (3.5 km) | 2016 | 16 | 1 |
| Sun Link | Tucson | 1,676,500 | 3.9 mi (6.3 km) | 2014 | 22 | 1 |
| Seattle Streetcar | Seattle | 1,384,500 | 3.8 mi (6.1 km) | 2007 | 21 | 2 |
| Connector | Cincinnati | 1,198,859 | 3.6 mi (5.8 km) | 2016 | 18 | 1 |
| TECO Line Streetcar | Tampa | 1,156,800 | 2.7 mi (4.3 km) | 2002 | 11 | 1 |
| Q-Line | Detroit | 896,900 | 3.3 mi (5.3 km) | 2017 | 20 | 1 |
| Tide Light Rail | Norfolk | 853,300 | 7.4 mi (11.9 km) | 2011 | 11 | 1 |
| DC Streetcar | Washington, D.C. | 835,900 | 2.4 mi (3.9 km) | 2016 | 8 | 1 |
| RTA Rapid Transit | Cleveland | 808,100 | 15.3 mi (24.6 km) | 1913 | 34 | 2 |
| Tempe Streetcar | Tempe | 793,628 | 3 mi (4.8 km) | 2022 | 14 | 1 |
| Dallas Streetcar | Dallas | 701,904 | 2.45 mi (3.94 km) | 2015 | 6 | 1 |
| The Hop | Milwaukee | 532,460 | 2.1 mi (3.4 km) | 2018 | 21 | 2 |
| Atlanta Streetcar | Atlanta | 342,700 | 2.7 mi (4.3 km) | 2014 | 12 | 1 |
| El Paso Streetcar | El Paso | 275,500 | 4.8 mi (7.7 km) | 2018 | 27 | 2 |
| MATA Trolley | Memphis | 233,400 | 2 mi (3.2 km) | 1993 | 11 | 1 |
| Oklahoma City Streetcar | Oklahoma City | 224,305 | 5.6 mi (9.0 km) | 2018 | 22 | 2 |
Note that the Las Vegas Monorail and the Little Rock Metro Streetcar have both been excluded for being tourist focused rather than commuter systems.
And here is the total number of systems for each state. Note that when a system serves multiple states e.g. Washington Metro, it counts for all states served.

Are you surprised by how many states have a system?


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David Crook says
What about commuter services that use traditional rail lines? Long Island RR (NY), Metro North (NY-CT), CT Rail (CT), New Jersey Transit (NJ-NY), Metro Link (Greater LA), CalTrain (SF Bay Area) and lots of others… https://en.wikipedia.org/wiki/List_of_United_States_commuter_rail_systems