- Clarion Municipal AirportIdent: KCAVServes: Clarion
- Clarissa Municipal AirportIdent: 8Y5Serves: Browerville
- Clark AirportIdent: 23ISServes: Plymouth
- Clark AirportIdent: 3T6Serves: Justin
- Clark County AirportIdent: K8D7Serves: Clark
- Clark FieldIdent: 20LSServes: Zachary
- Clark FieldIdent: 8FA1Serves: Raiford
- Clark FieldIdent: ME96Serves: Gorham
- Clark Regional AirportIdent: KJVYServes: Jeffersonville
- Clark Sky Ranch AirportIdent: 3TA2Serves: Sealy
- Clarks Point AirportIdent: PFCLServes: Clarks Point
- Clarksville AirportIdent: 74FDServes: Clarksville
- Clarksville Municipal AirportIdent: KH35Serves: Clarksville
- Clarksville Red River City-J D Trissell FieldIdent: KLBRServes: Clarksville
- Clarksville–Montgomery County Regional AirportIdent: KCKVServes: Clarksville
- Classic AirstripIdent: 23ARServes: Jonesboro
- Classic Landings AirportIdent: 05ILServes: Bonfield
- Claucherty AirportIdent: MI35Serves: Litchfield
- Claxton Evans County AirportIdent: KCWVServes: Claxton
- Clay AirportIdent: MS50Serves: Monticello
- Clay Center Municipal AirportIdent: KCYWServes: Clay Center
- Clayton Lake StripIdent: ME19Serves: Clayton Lake
- Clayton Municipal AirparkIdent: KCAOServes: Clayton
- Clayton Municipal AirportIdent: K11AServes: Clayton
- Cle Elum Municipal AirportIdent: S93Serves: Cle Elum
- Clear Creek AirportIdent: 2AK2Serves: Fort Wainwright
- Clear Lake Municipal AirportIdent: 5H3Serves: Clear Lake
- Clear Sky Ag AirportIdent: US-8149Serves: Arapahoe
- Clearfield Lawrence AirportIdent: KFIGServes: Clearfield
- Clearview AirparkIdent: 2W2Serves: Westminster
- Clearwater Aero Estates AirportIdent: JB01Serves: Oxford
- Clearwater Air ParkIdent: KCLWServes: Clearwater
- Clearwater AirparkIdent: 21OIServes: Batavia
- Cleburne Regional AirportIdent: KCPTServes: Cleburne
- Clemens AirportIdent: US-1972Serves: Parsons
- Clements AirportIdent: 4MD4Serves: Clements
- Clermont County AirportIdent: KI69Serves: Batavia
- Cleveland Municipal AirportIdent: K95FServes: Cleveland
- Cleveland Municipal AirportIdent: KRNVServes: Cleveland
- Cleveland Regional JetportIdent: KRZRServes: Cleveland
- Cliff Dow AirportIdent: 54MEServes: New Gloucester
- Cliff Dwellers Lodge AirportIdent: AZ03Serves: Marble Canyon
- Cliff Hatfield Memorial AirportIdent: KCLRServes: Calipatria
- Clifford FieldIdent: 1CO4Serves: Olathe
- Cliffords AirportIdent: ME69Serves: Sabattus
- Cline Falls Air ParkIdent: 3OR8Serves: Redmond
- Clinton County AirportIdent: KI66Serves: Wilmington
- Clinton Memorial AirportIdent: KGLYServes: Clinton
- Clinton Municipal AirportIdent: KCCAServes: Clinton
- Clinton Municipal AirportIdent: KCWIServes: Clinton
- Clinton Regional AirportIdent: KCLKServes: Clinton
- Clinton Sherman AirportIdent: KCSMServes: Clinton
- Clinton-Hickman County AirportIdent: 0KY7Serves: Clinton
- Clintonville Municipal AirportIdent: KCLIServes: Clintonville
- Clio Crop Care AirportIdent: 9W9Serves: Clio
- Cloquet Carlton County AirportIdent: KCOQServes: Cloquet
- Cloud 9 AerodromeIdent: 40TNServes: Bean Station
- Cloud 9 AirportIdent: 2ND5Serves: Turtle Lake
- Cloud AirportIdent: 7KS2Serves: Overbrook
- Cloud Dancer Private AirportIdent: WS13Serves: Chetek