Interurban / 54 metros

Fifty-four metros, one script, no API key

127,792,392 residents across 31,521 census tracts. Every figure below is US Census 2020, observed, unrounded. 15 of these metros start with real rail already on the map, drawn from the operating agency's own published feed; the other 39 start with nothing, which is also true of them.

Northeast 8 metros

Metro	Counties in the pack	Residents	Tracts	Existing rail
New York City	New York, Kings, Queens, Bronx, Richmond	8,804,190	2,324	29 lines, 970 stops
Philadelphia	Philadelphia, Delaware, Montgomery, Bucks	3,683,718	926	none
Boston	Suffolk, Middlesex, Norfolk	3,155,919	745	22 lines, 342 stops
Newark & North Jersey	Essex, Hudson, Union, Bergen	3,119,659	717	none
Pittsburgh	Allegheny	1,250,578	394	none
Buffalo	Erie	954,236	260	none
Hartford	Hartford	899,498	235	none
Providence	Providence	660,741	145	none

Mid-Atlantic & South 15 metros

Metro	Counties in the pack	Residents	Tracts	Existing rail
Miami	Miami-Dade, Broward	4,646,142	1,122	4 lines, 43 stops
Atlanta	Fulton, DeKalb, Cobb, Gwinnett	3,554,303	936	6 lines, 77 stops
Tampa & St. Petersburg	Hillsborough, Pinellas	2,418,869	606	none
Orlando	Orange, Seminole, Osceola	2,289,420	414	none
Raleigh & Durham	Wake, Durham	1,454,243	298	none
Baltimore	Baltimore city, Baltimore	1,440,243	418	5 lines, 86 stops
Nashville	Davidson, Williamson, Rutherford	1,305,096	284	none
Charlotte	Mecklenburg	1,115,482	305	none
Jacksonville	Duval	995,567	218	none
Memphis	Shelby	929,744	249	none
Richmond	Richmond city, Henrico, Chesterfield	925,547	235	none
New Orleans	Orleans, Jefferson	824,778	309	none
Louisville	Jefferson	782,969	216	none
Washington DC	District of Columbia	689,545	206	none
Birmingham	Jefferson	674,721	189	none

Midwest 11 metros

Metro	Counties in the pack	Residents	Tracts	Existing rail
Chicago	Cook, DuPage	6,208,418	1,550	8 lines, 185 stops
Detroit	Wayne, Oakland, Macomb	3,949,173	1,218	none
Minneapolis–Saint Paul	Hennepin, Ramsey, Anoka, Dakota	2,637,686	668	3 lines, 47 stops
Milwaukee	Milwaukee, Waukesha	1,346,467	399	none
Indianapolis	Marion, Hamilton	1,324,670	310	none
Columbus	Franklin	1,323,807	328	none
Cleveland	Cuyahoga	1,264,817	427	none
Kansas City	Jackson, Clay, Platte	1,077,257	309	none
Cincinnati	Hamilton	830,639	226	none
Omaha	Douglas, Sarpy	775,130	210	none
St. Louis	St. Louis city, St. Louis	603,156	208	6 lines, 135 stops

Texas & Plains 5 metros

Metro	Counties in the pack	Residents	Tracts	Existing rail
Dallas & Fort Worth	Dallas, Tarrant, Collin, Denton	6,695,066	1,507	8 lines, 152 stops
Houston	Harris, Fort Bend	5,553,924	1,248	none
San Antonio	Bexar	2,009,324	375	none
Austin	Travis, Williamson	1,899,205	425	none
Oklahoma City	Oklahoma, Cleveland	1,091,820	337	none

Mountain West 7 metros

Metro	Counties in the pack	Residents	Tracts	Existing rail
Phoenix	Maricopa	4,420,568	1,009	none
Denver	Denver, Jefferson, Arapahoe, Adams	2,473,074	592	10 lines, 110 stops
Las Vegas	Clark	2,265,461	535	none
Salt Lake City	Salt Lake, Utah, Davis	2,207,316	473	20 lines, 507 stops
Tucson	Pima	1,043,433	270	none
Boise	Ada, Canyon	726,072	183	none
Albuquerque	Bernalillo	676,444	176	none

Pacific 8 metros

Metro	Counties in the pack	Residents	Tracts	Existing rail
Los Angeles	Los Angeles	10,014,009	2,495	6 lines, 126 stops
San Francisco Bay	San Francisco, Alameda, San Mateo, Contra Costa	4,486,687	1,034	12 lines, 230 stops
Seattle	King, Snohomish, Pierce	4,018,762	860	2 lines, 17 stops
San Diego	San Diego	3,298,634	736	7 lines, 116 stops
Sacramento	Sacramento, Placer, Yolo	2,206,197	507	none
San Jose	Santa Clara	1,936,259	408	none
Portland	Multnomah, Washington, Clackamas	1,837,201	418	none
Honolulu	Honolulu	1,016,508	329	none

Counties listed are exactly what each pack covers — a pack is the metro as the data defines it, not as a marketing map draws it, and where a pack is one county the page says one county. Tract counts are the 2020 vintage.