| LGU | KLGU | Cache Airport | Logan | |
| CIR | KCIR | Cairo Airport | Cairo | |
| LLX | - | Caledonia County Airport | Lyndonville | |
| CXL | KCXL | Calexico International Airport | Calexico | |
| - | KCMA | Camarillo Airport | Camarillo | |
| JST | KJST | Cambria County Airport | Johnstown | |
| HOP | KHOP | Campbell Army Airfield | Hopkinsville | |
| GCC | KGCC | Campbell County Airport | Gillette | |
| CVS | KCVS | Cannon Air Force Base | Clovis | |
| CNE | - | Canon City Airport | Canon City | |
| CNY | KCNY | Canyonlands Field | Moab | |
| CGI | KCGI | Cape Girardeau Airport | Cape Girardeau | |
| LUR | PALU | Cape Lisburne Airport | Cape Lisburne | |
| WWD | KWWD | Cape May County Airport | Wildwood | |
| SPI | KSPI | Capital Airport | Springfield | |
| PUC | KPUC | Carbon County Regional Airport | Price | |
| CPR | KCPR | Casper/Natrona County International Airport | Casper | |
| AVX | KAVX | Catalina Airport | Avalon | |
| OLE | KOLE | Cattaraugus County Airport | Olean | |
| CNM | KCNM | Cavern City Air Terminal | Carlsbad | |
| VQQ | KVQQ | Cecil Airport | Jacksonville | |
| CDC | KCDC | Cedar City Airport | Cedar City | |
| CEM | - | Central Airport | Central | |
| BMI | KBMI | Central Illinois Regional Airport | Bloomington | |
| JVI | - | Central Jersey Regional Airport | Manville | |
| CWA | KCWA | Central Wisconsin Airport | Wausau | |
| CDR | KCDR | Chadron Airport | Chadron | |
| CIK | - | Chalkyitsik Airport | Chalkyitsik | |
| - | - | Chandelle Estates Airport | Dover | |
| AXN | KAXN | Chandler Field | Alexandria | |
| - | KJZI | Charleston Executive Airport | Charleston | |
| - | KCVX | Charlevoix Municipal | Charlevoix | |
| PGD | KPGD | Charlotte County Airport | Punta Gorda | |
| CYF | PACK | Chefornak Sea Plane Base | Chefornak | |
| CWF | KCWF | Chennault International Airport | Lake Charles | |
| TVC | KTVC | Cherry Capital Airport | Traverse City | |
| - | KCPK | Chesapeake Regional Airport | Chesapeake | |
| CTH | KMQS | Chester County G. O. Carlson Airport | Coatesville | |
| VAK | - | Chevak Airport | Chevak | |
| CYS | KCYS | Cheyenne Regional Airport | Cheyenne | |
| PWK | KPWK | Chicago Executive Airport | Chicago | |
| RFD | KRFD | Chicago Rockford International Airport | Rockford | |
| CKX | - | Chicken Airport | Chicken | |
| CIC | KCIC | Chico Municipal Airport | Chico | |
| KCG | - | Chignik Fisheries Airport | Chignik | |
| KCL | - | Chignik Lagoon Airport | Chignik | |
| KCQ | PAJC | Chignik Lake Airport | Chignik | |
| CNO | KCNO | Chino Airport | Chino | |
| CIU | KCIU | Chippewa County Airport | Sault Ste. Marie | |
| HIB | KHIB | Chisholm Airport | Hibbing | |