| Hard to Cicero (Illinois) | 4,474.10 mi (7,200.38 km) |
| Hard to Cimarron Hills (Colorado) | 5,237.63 mi (8,429.15 km) |
| Hard to Cincinnati (Ohio) | 4,472.04 mi (7,197.06 km) |
| Hard to Cinco Ranch (Texas) | 5,383.42 mi (8,663.78 km) |
| Hard to Circleville (Ohio) | 4,387.81 mi (7,061.50 km) |
| Hard to Citrus (California) | 5,932.05 mi (9,546.72 km) |
| Hard to Citrus Heights (California) | 5,762.15 mi (9,273.29 km) |
| Hard to Citrus Park (Florida) | 4,914.44 mi (7,909.02 km) |
| Hard to Claiborne (Louisiana) | 5,098.51 mi (8,205.26 km) |
| Hard to Claremont (California) | 5,926.13 mi (9,537.19 km) |
| Hard to Claremont (New Hampshire) | 3,796.07 mi (6,109.19 km) |
| Hard to Claremore (Oklahoma) | 5,041.69 mi (8,113.82 km) |
| Hard to Clarksburg (Maryland) | 4,173.22 mi (6,716.16 km) |
| Hard to Clarksburg (West Virginia) | 4,296.47 mi (6,914.51 km) |
| Hard to Clarksdale (Mississippi) | 4,950.95 mi (7,967.78 km) |
