- Chumuckla 20-20 AirportIdent: 93FDServes: Milton
- Chupadera Ranch AirportIdent: 95TXServes: Carrizo Springs
- Church Hill AirportIdent: MD62Serves: Church Hill
- Church Point Flyers AirportIdent: 6LA5Serves: Church Point
- Church's Landing AirportIdent: 1MU8Serves: Rushville
- Chute Happens Ultralight FieldIdent: 84TTServes: Royse City
- Cibolo Creek Ranch AirportIdent: TS15Serves: Marfa
- Cibolo Sea-Willo AirparkIdent: TE67Serves: New Berlin
- Cider FieldIdent: PS70Serves: Friedensburg
- Cider Run AirportIdent: US-3281Serves: Estacada
- Cielo Dorado Estates AirportIdent: TA50Serves: Anthony
- Cielo Grande Ranch AirportIdent: 87TAServes: Mountain Home
- Cimarron Municipal AirportIdent: 8K8Serves: Cimarron
- Cincinnati West AirportIdent: KI67Serves: Harrison
- Cinco B Ranch AirportIdent: 87XSServes: Medina
- Circle 8 Ranch AirportIdent: CO42Serves: Elizabeth
- Circle A Ranch AirportIdent: 05TXServes: Blum
- Circle A Ranch AirportIdent: 48WIServes: Hazelhurst
- Circle B AirportIdent: WY32Serves: Cokeville
- Circle Bar Ranch AirportIdent: 46MSServes: Foxworth
- Circle C AirportIdent: 89OIServes: Berlin Center
- Circle C Ranch AirportIdent: TT19Serves: Hardin
- Circle City (New) AirportIdent: PACRServes: Circle
- Circle Eight Ranch AirportIdent: XA04Serves: Bluff Dale
- Circle G AirportIdent: LS16Serves: Jigger
- Circle H Ranch AirportIdent: AZ17Serves: Douglas
- Circle Hot Springs AirportIdent: CHPServes: Circle Hot Springs
- Circle K AirportIdent: WS45Serves: Irma
- Circle L Ranch AirportIdent: NV27Serves: Dyer
- Circle P AirportIdent: FA32Serves: Perry
- Circle P Farm AirportIdent: 6NC7Serves: Newport
- Circle P Ranch AirportIdent: 41TAServes: Bluff Dale
- Circle P Ranch AirportIdent: 82XSServes: Floresville
- Circle R Ranch AirportIdent: 2TS4Serves: Malakoff
- Circle S Farms AirportIdent: AR91Serves: Lowell
- Circle T AirportIdent: 98GAServes: Indian Springs
- Circle Town County AirportIdent: K4U6Serves: Circle
- Circle W AirfieldIdent: PA72Serves: East Berlin
- Circle WC Ranch AirportIdent: US-6266Serves: Bogata
- Circle Z Landing StripIdent: NA90Serves: Underwood
- Circling Sky AerodromeIdent: 43MSServes: Canton
- Citabriair AirportIdent: UT43Serves: Kanarraville
- Citrus Hedging Ranch AirportIdent: 96FDServes: Okeechobee
- City of Coalgate AirportIdent: 08FServes: Coalgate
- City of Eupora AirportIdent: K06MServes: Eupora
- City of Las Animas Bent County AirportIdent: K7V9Serves: Las Animas
- City of Murfreesboro AirportIdent: KMBTServes: Murfreesboro
- City of Tulia-Swisher County Municipal AirportIdent: KI06Serves: Tulia
- Cizek North AirportIdent: 6AK9Serves: Wasilla
- Ckye FieldIdent: MT32Serves: Stevensville
- Clair RLAIdent: US-12971Serves: Loraine
- Clam Harbor AirportIdent: WA35Serves: Eastsound
- Clare County AirportIdent: K80DServes: Harrison
- Clare Municipal AirportIdent: K48DServes: Clare
- Claremont Municipal AirportIdent: KCNHServes: Claremont
- Claremore Regional AirportIdent: KGCMServes: Claremore
- Clarence AerodromeIdent: D51Serves: Buffalo
- Clarence E Page Municipal AirportIdent: KF29Serves: Oklahoma City
- Clarendon Municipal AirportIdent: 4M8Serves: Roe
- Clarion County AirportIdent: KAXQServes: Clarion