| Potomac to Crawfordsville (Indiana) | 521.70 mi (839.60 km) |
| Potomac to Crest Hill (Illinois) | 601.43 mi (967.91 km) |
| Potomac to Crestview (Florida) | 779.56 mi (1,254.58 km) |
| Potomac to Crestwood (Illinois) | 583.99 mi (939.83 km) |
| Potomac to Crestwood (Missouri) | 710.14 mi (1,142.87 km) |
| Potomac to Creve Coeur (Missouri) | 712.81 mi (1,147.15 km) |
| Potomac to Crofton (Maryland) | 27.61 mi (44.43 km) |
| Potomac to Crossville (Tennessee) | 478.60 mi (770.24 km) |
| Potomac to Crowley (Louisiana) | 1,053.37 mi (1,695.23 km) |
| Potomac to Crowley (Texas) | 1,211.09 mi (1,949.07 km) |
| Potomac to Crown Point (Indiana) | 560.30 mi (901.71 km) |
| Potomac to Crystal (Minnesota) | 925.96 mi (1,490.18 km) |
| Potomac to Crystal Lake (Illinois) | 624.56 mi (1,005.13 km) |
| Potomac to Cudahy (California) | 2,284.03 mi (3,675.79 km) |
| Potomac to Cudahy (Wisconsin) | 618.70 mi (995.70 km) |
