| Transit agency | City | Vehicles operated directly | Website |
|---|---|---|---|
| Connecticut Department of Transportation - CTTRANSIT - Hartford Division | Hartford | 213 | Official site |
| Connecticut Department of Transportation - CTTRANSIT New Haven Division | Hartford | 99 | Official site |
| Connecticut Department of Transportation- CTTransit Waterbury- NET | Watertown | 62 | Official site |
| Norwalk Transit District | Norwalk | 61 | Official site |
| Greater New Haven Transit District | Hamden | 51 | Official site |
| Connecticut Department of Transportation - CTTRANSIT Stamford Division | Hartford | 43 | Official site |
| Housatonic Area Regional Transit | Danbury | 41 | Official site |
| Greater Bridgeport Transit Authority | Bridgeport | 40 | Official site |
| Windham Region Transit District | Mansfield Center | 26 | Official site |
| Southeast Area Transit District | Preston | 24 | Official site |
| Estuary Transit District | Middletown | 23 | Official site |
| Northeastern Connecticut Transit District | Dayville | 16 | Official site |
| Northwestern CT Transit District | Torrington | 12 | Official site |
| Valley Transit District | Derby | 12 | Official site |
| Milford Transit District | Milford | 11 | Official site |
| Mashantucket Pequot Tribal Nation | Mashantucket | 1 | Official site |
| Connecticut Department of Transportation | Newington | 0 | Official site |
| Greater Hartford Transit District | Hartford | 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.