- Cache
- Caddo
- Calera
- Calumet
- Calvin
- Camargo
- Cameron
- Canadian
- Caney
- Canton
- Canute
- Capron
- Cardin
- Carlisle
- Carmen
- Carnegie
- Carrier
- Carter
- Cartwright
- Cashion
- Castle
- Catoosa
- Cayuga
- Cedar Crest
- Cedar Valley
- Cement
- Centrahoma
- Central High
- Chelsea
- Cherokee
- Cherry Tree
- Chester
- Chewey
- Chickasha
- Choctaw
- Chouteau
- Christie
- Cimarron City
- Clayton
- Clearview
- Cleo Springs
- Cleora
- Cloud Creek
- Coalgate
- Colbert
- Colcord
- Cole
- Colony
- Comanche
- Commerce
- Cooperton
- Copan
- Copeland
- Cordell
- Corn
- Cornish
- Council Hill
- Covington
- Coweta
- Cowlington
- Coyle
- Crescent
- Cromwell
- Crowder
- Custer City
- Cyril
