| Coshocton, OH (City) |
| Coshocton County, OH (County) |
| Cosmo, NE (Township) |
| Cosmopolis, WA (City) |
| Cosmos, MN (City) |
| Cosmos, MN (Township) |
| Costa Mesa, CA (City) |
| Costilla County, CO (County) |
| Cotati, CA (City) |
| Cotesfield, NE (Village) |
| Cottage City, MD (Town) |
| Cottage Grove, MN (City) |
| Cottage Grove, OR (City) |
| Cottage Grove, TN (Town) |
| Cottage Grove, KS (Township) |
