| Transit agency | City | Vehicles operated directly | Website |
|---|---|---|---|
| Chicago Transit Authority | Chicago | 2,505 | Official site |
| Pace, the Suburban Bus Division of the Regional Transportation Authority | Arlington Heights | 798 | Official site |
| Northeast Illinois Regional Commuter Railroad Corporation | Chicago | 447 | Official site |
| Rides Mass Transit District | Harrisburg | 116 | Official site |
| South Central Illinois Mass Transit District | Centralia | 112 | Official site |
| Champaign-Urbana Mass Transit District | Urbana | 106 | Official site |
| Springfield Mass Transit District | Springfield | 66 | Official site |
| Rock Island County Metropolitan Mass Transit District | Moline | 56 | Official site |
| Bloomington-Normal Public Transit System | Normal | 52 | Official site |
| Rockford Mass Transit District | Rockford | 52 | Official site |
| Shawnee Mass Transit District | Vienna | 44 | Official site |
| Greater Peoria Mass Transit District | Peoria | 40 | Official site |
| Madison County Transit District | Pontoon Beach | 31 | Official site |
| McLean County | Bloomington | 27 | Official site |
| Bureau County | Princeton | 25 | Official site |
| Lee County | Dixon | 25 | Official site |
| West Central Mass Transit District | Jacksonville | 25 | Official site |
| City of Ottawa | Ottawa | 21 | Official site |
| Shelby County | Shelbyville | 21 | Official site |
| Jackson County Mass Transit District | Carbondale | 20 | Official site |
| City of Quincy | Quincy | 18 | Official site |
| Jo Daviess County | Galena | 18 | Official site |
| Kendall County | Yorkville | 17 | Official site |
| Bond County | Greenville | 16 | Official site |
| City of Macomb | Macomb | 16 | Official site |
| Coles County | Charleston | 16 | Official site |
| CRIS Rural Mass Transit District | Danville | 16 | Official site |
| Macoupin County | Carlinville | 16 | Official site |
| Piatt County | Monticello | 15 | Official site |
| Tazewell County | Pekin | 15 | Official site |
| Henry County | Cambridge | 14 | Official site |
| Carroll County | Mount Carroll | 13 | Official site |
| Effingham County | Effingham | 13 | Official site |
| Jersey County | Jerseyville | 13 | Official site |
| Whiteside County | Morrison | 13 | Official site |
| City of Freeport | Freeport | 11 | Official site |
| Monroe Randolph Transit District | Sparta | 11 | Official site |
| City of Danville | Danville | 10 | Official site |
| City of Galesburg | Galesburg | 10 | Official site |
| Grundy County | Morris | 10 | Official site |
| Kankakee County | Kankakee | 10 | Official site |
| Marshall County | Lacon | 10 | Official site |
| Rock Island County | Rock Island | 10 | Official site |
| Hanover Township | Bartlett | 9 | Official site |
| Champaign County | Urbana | 8 | Official site |
| City of Berwyn | Berwyn | 7 | Official site |
| Warren County | Monmouth | 7 | Official site |
| Wheeling Township | Arlington Heights | 7 | Official site |
| Woodford County | Eureka | 7 | Official site |
| Fulton County | Lewistown | 6 | Official site |
| Rich Township | Richton Park | 6 | Official site |
| Sangamon County | Springfield | 6 | Official site |
| Bloom Township | Chicago Heights | 5 | Official site |
| Bremen Township | Oak Forest | 5 | Official site |
| Town of Cicero | Cicero | 5 | Official site |
| Douglas County (Illinois) | Charleston | 4 | Official site |
| Hampshire Township | Hampshire | 4 | Official site |
| Logan County | Lincoln | 4 | Official site |
| McHenry Township | Johnsburg | 4 | Official site |
| Palatine Township | Palatine | 4 | Official site |
| Calumet Township | Blue Island | 3 | Official site |
| Hancock County | Carthage | 3 | Official site |
| Lemont Township | Lemont | 3 | Official site |
| Worth Township | Alsip | 3 | Official site |
| City of Oak Forest | Oak Forest | 2 | Official site |
| City of Palos Hills | Palos Hills | 2 | Official site |
| Grant Township | Ingleside | 2 | Official site |
| Lisle Township | Lisle | 2 | Official site |
| Moraine Township | Highland Park | 2 | Official site |
| Orland Township | Orland Park | 2 | Official site |
| Triton College | River Grove | 2 | Official site |
| Village of Bellwood | Bellwood | 2 | Official site |
| Village of Forest Park | Forest Park | 2 | Official site |
| Village of Melrose Park | Melrose Park | 2 | Official site |
| Chicago State University | Chicago | 1 | Official site |
| City of Palos Heights | Palos Heights | 1 | Official site |
| City of Wood Dale | Wood Dale | 1 | Official site |
| Lake Villa Township | Lake Villa | 1 | Official site |
| Village of Crestwood | Crestwood | 1 | Official site |
| Village of Elmwood Park | Elmwood Park | 1 | Official site |
| Village of Fox Lake | Fox Lake | 1 | Official site |
| Village of Harwood Heights | Harwood Heights | 1 | Official site |
| Village of Norridge | Norridge | 1 | Official site |
| Village of Orland Hills | Orland Hills | 1 | Official site |
| Village of Orland Park | Orland Park | 1 | Official site |
| Village of River Grove | River Grove | 1 | Official site |
| Village of South Chicago Heights | South Chicago Heights | 1 | Official site |
| Washington Township | Beecher | 1 | Official site |
| Waukegan Township | Waukegan | 1 | Official site |
| City of Decatur, Il | Decatur | 0 | Official site |
| City of DeKalb | Dekalb | 0 | Official site |
| Pace, the Suburban Bus Division of the Regional Transportation Authority | Arlington Heights | 0 | Official site |
| River Valley Metro Mass Transit District | Bourbonnais | 0 | Official site |
| Village of Park Forest | Park Forest | 0 | Official site |
| Village of Schaumburg | Schaumburg | 0 | Official site |
Largest first by vehicles operated directly, as each employer reports it to its federal registry.
Source: Federal Transit Administration, National Transit Database 2024 — Reporter Agency Information. Data captured September 30, 2026.