| Potomac to Cibolo (Texas) | 1,361.19 mi (2,190.63 km) |
| Potomac to Cicero (Illinois) | 588.59 mi (947.24 km) |
| Potomac to Cimarron Hills (Colorado) | 1,472.58 mi (2,369.89 km) |
| Potomac to Cincinnati (Ohio) | 392.17 mi (631.13 km) |
| Potomac to Cinco Ranch (Texas) | 1,233.92 mi (1,985.81 km) |
| Potomac to Circleville (Ohio) | 309.47 mi (498.04 km) |
| Potomac to Citrus (California) | 2,264.55 mi (3,644.44 km) |
| Potomac to Citrus Heights (California) | 2,348.77 mi (3,779.99 km) |
| Potomac to Citrus Park (Florida) | 816.30 mi (1,313.71 km) |
| Potomac to Claiborne (Louisiana) | 950.93 mi (1,530.38 km) |
| Potomac to Claremont (California) | 2,255.01 mi (3,629.08 km) |
| Potomac to Claremont (New Hampshire) | 393.21 mi (632.81 km) |
| Potomac to Claremore (Oklahoma) | 1,022.48 mi (1,645.52 km) |
| Potomac to Clarksburg (Maryland) | 15.04 mi (24.21 km) |
| Potomac to Clarksburg (West Virginia) | 168.69 mi (271.49 km) |
