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.

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	System	Transit agency	City/area served	Annual ridership 2025 ^[1]	Avg. ridership weekdays, Q2 2026 ^[2]	System length	Avg. boardings per mile weekdays, Q2 2026	Opened	Stations	Lines
1	New York City Subway	NYCTA^{[note 1]}	New York City	2,314,388,000	7,686,700	248 mi (399 km)^[3]	30,995	1904^[4]	472^[4]	36^[4]
2	Washington Metro	WMATA	Washington, DC metropolitan area	188,549,700	675,100	129 mi (208 km)^[5]	5,233	1976^[5]	98^[5]	6
3	Chicago "L"	CTA	Chicago	135,202,800	447,000	102.8 mi (165.4 km)^[6]	4,348	1892^[6]	146^[6]	8^[6]
4	MBTA subway ("the T")^{[note 2]} (Blue, Orange, and Red lines)	MBTA	Boston	101,054,600	371,800	38 mi (61 km)^[7]	9,784	1901	53^[7]	3^[7]
5	SEPTA Metro^{[note 3]} (L, B, and M)	SEPTA	Philadelphia	65,471,700	219,000	36.7 mi (59.1 km)^[8]^[9]	5,967	1907^[10]	75^[11]	3^[11]
6	PATH	PANYNJ	Manhattan, Hudson County, Newark	64,318,300	228,400	13.8 mi (22.2 km)^[12]^[13]	16,551	1908^[14]	13^[12]	4^[15]
7	Bay Area Rapid Transit (BART)^{[note 4]}	BART	San Francisco Bay Area	53,678,000	198,600	131.4 mi (211.5 km)^[16]	1,668	1972^[17]	50^[16]	7^[18]
8	MARTA rail	MARTA	Atlanta	30,373,600	152,000	47.6 mi (76.6 km)	3,193	1979^[19]	38^[20]	4^[20]
9	Metro Rail^{[note 3]} (B and D lines)	LACMTA	Los Angeles	20,990,600	68,400	21.3 mi (34.3 km)^[21]^[22]	3,931	1993^[23]	19^[23]	2^[23]
10	Metrorail	Miami-Dade Transit	Miami	14,971,300	50,100	24.4 mi (39.3 km)^[24]	2,053	1984^[25]	23^[24]	2^[24]
11	PATCO Speedline	PATCO	Philadelphia, Camden County	5,865,800	19,800	14.2 mi (22.9 km)^[26]	1,394	1936^[26]	14^[26]	1^[26]
12	Staten Island Railway	SIRTOA^{[note 1]}	Staten Island	5,437,400	21,000	14 mi (23 km)^[3]	1,500	1860^[27]	21^[3]	1^[3]
13	Baltimore Metro SubwayLink	MTA	Baltimore	4,610,400	12,600^{[note 5]}	15.5 mi (24.9 km)^[28]	815	1983^[29]	14^[28]	1^[28]
14	Tren Urbano	ATI	San Juan	4,438,400	20,900	10.7 mi (17.2 km)^[30]	1,953	2004^[30]	16^[30]	1^[30]
15	RTA Rapid Transit^{[note 3]} (Red Line)	GCRTA	Cleveland	2,860,500	9,300	19 mi (31 km)^[31]	489	1955^[32]	18^[31]	1^[31]
16	Skyline	Honolulu DTS	Honolulu	1,696,800	11,600	16.1 mi (25.9 km)	720	2023^[33]	13^[34]	1^[33]