List of United States rapid transit systems

The following is a list of all heavy rail rapid transit systems in the United States. It does not include statistics for bus or light rail systems; see: List of United States light rail systems by ridership for light rail systems. All ridership figures represent unlinked passenger trips, so line transfers on multi-line systems register as separate trips. The data is provided by the American Public Transportation Association's Ridership Reports.

Note: ridership does not mean unique passengers, it means total number of trips.

	System	Transit agency	City/area served	Annual ridership 2024 [1]	Avg. ridership weekdays, Q2 2025 [2]	System length	Avg. boardings per mile weekdays, Q2 2025	Opened	Stations	Lines
1	New York City Subway	NYCTA[note 1]	New York City	2,040,132,000	7,434,700	248 mi (399 km)[3]	29,979	1904[4]	472[4]	26[4]
2	Washington Metro	WMATA	Washington metropolitan area	166,654,000	668,000	129 mi (208 km)[5]	5,178	1976[5]	98[5]	6
3	Chicago "L"	CTA	Chicago	127,463,400	422,200	102.8 mi (165.4 km)[6]	4,107	1892[6]	146[6]	8[6]
4	MBTA subway ("the T")[note 2] (Blue, Orange, and Red lines)	MBTA	Boston	84,251,600	304,900	38 mi (61 km)[7]	8,024	1901	53[7]	3[7]
5	PATH	PANYNJ	Manhattan, Hudson County, Newark	62,489,400	221,900	13.8 mi (22.2 km)[8][9]	16,080	1908[10]	13[8]	4[11]
6	SEPTA Metro[note 3] (L, B, and M)	SEPTA	Philadelphia	59,009,800	219,000	36.7 mi (59.1 km)[12][13]	5,967	1907[14]	75[15]	3[15]
7	Bay Area Rapid Transit (BART)[note 4]	BART	San Francisco Bay Area	49,075,000	174,100	131.4 mi (211.5 km)[16]	1,462	1972[17]	50[16]	7[18]
8	MARTA rail	MARTA	Atlanta	29,416,400	96,100	47.6 mi (76.6 km)	2,019	1979[19]	38[20]	4[20]
9	Metro Rail[note 3] (B and D lines)	LACMTA	Los Angeles	22,471,200	62,000	17.4 mi (28.0 km)[21]	3,563	1993[21]	16[21]	2[21]
10	Metrorail	Miami-Dade Transit	Miami	14,911,300	53,200	24.4 mi (39.3 km)[22]	2,180	1984[23]	23[22]	2[22]
11	PATCO Speedline	PATCO	Philadelphia, Camden County	5,640,600	19,400	14.2 mi (22.9 km)[24]	1,366	1936[24]	13[24]	1[24]
12	Baltimore Metro SubwayLink	MTA	Baltimore	5,487,000	15,000[note 5]	15.5 mi (24.9 km)[25]	970	1983[26]	14[25]	1[25]
13	Staten Island Railway	SIRTOA[note 1]	Staten Island	4,743,000	19,300	14 mi (23 km)[3]	1,379	1860[27]	21[3]	1[3]
14	Tren Urbano	ATI	San Juan	4,438,400	14,400	10.7 mi (17.2 km)[28]	1,346	2004[28]	16[28]	1[28]
15	RTA Rapid Transit[note 3] (Red Line)	GCRTA	Cleveland	3,151,500	8,900	19 mi (31 km)[29]	468	1955[30]	18[29]	1[29]
16	Skyline	Honolulu DTS	Honolulu	614,800	3,700	10.8 mi (17.4 km)	343	2023[31]	9[31]	1[31]