| MTO | KMTO | Coles County Memorial Airport | Mattoon | |
| - | - | Colfax | Colfax | |
| CGS | KCGS | College Park Airport | College Park | |
| - | - | Collegedale Municipal | Collegedale | |
| - | - | Colorado City | Colorado City | |
| - | KAZC | Colorado City Municipal | Colorado City | |
| - | - | Colorado Springs East | Ellicott | |
| - | - | Colstrip | Colstrip | |
| - | - | Columbia | Columbia | |
| - | - | Columbia Airport | Columbia Station | |
| COA | - | Columbia Airport | Columbia | |
| - | - | Columbia-Adair Co | Columbia | |
| - | - | Columbia-Marion Co | Columbia | |
| - | - | Columbiana Co | East Liverpool | |
| - | - | Columbus | Columbus | |
| CBM | KCBM | Columbus Air Force Base | Columbus | |
| OLU | KOLU | Columbus Airport | Columbus | |
| - | KCPC | Columbus Co Municipal | Whiteville | |
| - | - | Columbus Municipal | Columbus | |
| CUS | - | Columbus Municipal Airport | Columbus | |
| - | - | Columbus Southwest Airport | Columbus | |
| - | - | Colusa Co | Colusa | |
| - | - | Colville Municipal | Colville | |
| - | - | Comanche Co | Coldwater | |
| - | - | Comanche Co-City | Comanche | |
| JBP | - | Commerce Bus. Plaza Heliport | Los Angeles | |
| - | - | Commerce Municipal | Commerce | |
| CPM | KCPM | Compton Airport | Compton | |
| - | - | Conchas State Park | Conchas Dam | |
| - | - | Concord | Painesville | |
| - | - | Concordia Parish | Vidalia | |
| - | - | Concrete Municipal | Concrete | |
| - | - | Condon State Pauling | Condon | |
| - | - | Condon Usfs | Condon | |
| WSD | - | Condron Army Air Field | White Sands | |
| - | KVVS | Connellsville | Connellsville | |
| - | - | Conrad | Conrad | |
| JCE | - | Convention Center Heliport | Oakland | |
| - | - | Converse | Converse | |
| DGW | KDGW | Converse County Airport | Douglas | |
| - | KHYW | Conway-Horry Co | Conway | |
| - | - | Cook Co | Adel | |
| - | KCQM | Cook Municipal | Cook | |
| - | - | Coolidge Municipal | Coolidge | |
| COP | - | Cooperstown Airport | Cooperstown | |
| - | - | Cooperstown Municipal | Cooperstown | |
| - | - | Copalis State | Copalis | |
| - | - | Copeland | Ft Worth | |
| - | - | Copiah Co | Crystal Springs | |
| - | - | Copper Basin | Mackay | |