| - | - | Clarke Co | Quitman | |
| - | - | Clarks Dream Strip | Circleville | |
| - | - | Clarksville Municipal | Clarksville | |
| - | - | Clarksville-Red River Co | Clarksville | |
| - | KCWV | Claxton-Evans Co | Claxton | |
| - | KCYW | Clay Center Municipal | Clay Center | |
| - | - | Clayton Municipal | Clayton | |
| - | - | Cle Elum Municipal Airport | Cle Elum | |
| - | - | Clear Lake Municipal | Clear Lake | |
| - | - | Clear Sky Lodge | Clear | |
| - | KFIG | Clearfield-Lawrence | Clearfield | |
| - | - | Clearview Airpark | Westminster | |
| CLW | KCLW | Clearwater Air Park | Tampa | |
| - | - | Cleburne Municipal | Cleburne | |
| - | - | Clements Municipal | Bay City | |
| - | - | Clermont County Airport | Batavia | |
| - | - | Cleveland Municipal | Cleveland | |
| - | - | Cleveland Municipal | Cleveland | |
| - | KRNV | Cleveland Municipal | Cleveland | |
| CLR | KCLR | Cliff Hatfield Memorial Airport | Calipatria | |
| - | - | Clifton Municipal/Isenhower | Clifton | |
| - | - | Clinton | Clinton | |
| - | - | Clinton | Wilmington | |
| CWI | KCWI | Clinton Airport | Clinton | |
| PLB | KPLB | Clinton County Airport | Plattsburgh | |
| - | KGLY | Clinton Memorial | Clinton | |
| - | - | Clinton Municipal | Clinton | |
| CLI | KCLI | Clintonville Airport | Clintonville | |
| - | - | Clio Crop Care | Clio | |
| - | KCOQ | Cloquet Carlton Co | Cloquet | |
| - | - | Cloverdale Municipal | Cloverdale | |
| - | - | Clow International | Plainfield | |
| - | - | Cluck Ranch | Gruver | |
| - | - | Coal Creek | Yukon Charley Rivers | |
| CLG | - | Coalinga Airport | Coalinga | |
| - | - | Coastal | Pensacola | |
| - | KRYY | Cobb Co-Mc Collum | Marietta | |
| - | - | Cochise Co | Willcox | |
| - | - | Cochise College | Douglas | |
| - | - | Cochran | Cochran | |
| - | - | Cochran | Morton | |
| - | KUKL | Coffey Co | Burlington | |
| CFV | KCFV | Coffeyville Municipal Airport | Coffeyville | |
| RCK | KRCK | Coffield Airport | Rockdale | |
| - | - | Cokeville Municipal | Cokeville | |
| - | - | Col Dyke | Bethel | |
| - | - | Cold Meadows Usfs | Cold Meadows Guard Station | |
| - | - | Cole Ranch | Sterling City | |
| - | - | Colebrook | Colebrook | |
| COM | KCOM | Coleman Airport | Coleman | |