C
- Caldwell
- Campo
- Cantwell
- Cape Girardeau
- Cape Lisburne
- Cape Newenham
- Cape Romanzoff
- Carbondale / Murphysboro
- Caribou Municipal Airport
- Carlsbad
- Carlsbad Cavern City
- Cartersville
- Casper
- Cedar City
- Cedar Rapids
- Chadron
- Chamberlain
- Champaign / Urbana
- Chandalar Lake
- Chanute
- Chapel Hill, Williams Airport
- Charles City
- Charleston Air Force Base
- Charleston Yeager Airport
- Charlotte Douglas Intl Airport
- Charlottesville
- Chattanooga
- Chenault Airpark
- Cheyenne Airport
- Chicago-O'Hare Intl Airport
- Chico
- Chicopee Falls
- Childress Airport
- Chillicothe
- China Lake
- Chino
- Chulitna
- Cincinnati Covington Intl Apt
- Cincinnati Lunken Airport
- Clarksburg
- Clarksville, Outlaw Field Airport
- Clayton Airport
- Clayton Lake
- Cleveland
- Clinton-Sherman Airport
- Cocoa Beach
- Cody
- Coeur d'Alene
- Coffeyville
- Cold Bay
- College Station
- Colorado Springs
- Columbia
- Columbia
- Columbus
- Columbus
- Columbus Air Force Base
- Columbus/Balkalar
- Concord
- Concordia, Blosser Municipal Air
- Concord Municipal Airport
- Cordova
- Corpus Christi Intl Airport
- Corsicana
- Cortez
- Corvallis Municipal Automatic Weather Observing
- Cotulla
- Council Bluffs
- Cox Dayton International Airport
- Craig
- Crescent City
- Crestview
- Cross City
- Crossville
- Custer
- Cut Bank
