| Potomac to Candler-McAfee (Georgia) | 536.81 mi (863.91 km) |
| Potomac to Caño Martin Peña (Puerto Rico) | 1,571.22 mi (2,528.64 km) |
| Potomac to Cañon City (Colorado) | 1,505.15 mi (2,422.31 km) |
| Potomac to Canóvanas (Puerto Rico) | 1,578.97 mi (2,541.11 km) |
| Potomac to Canton (Georgia) | 521.35 mi (839.02 km) |
| Potomac to Canton (Illinois) | 689.76 mi (1,110.05 km) |
| Potomac to Canton (Mississippi) | 843.73 mi (1,357.85 km) |
| Potomac to Canton (Ohio) | 253.49 mi (407.95 km) |
| Potomac to Canyon (Texas) | 1,387.76 mi (2,233.38 km) |
| Potomac to Canyon Lake (California) | 2,241.51 mi (3,607.36 km) |
| Potomac to Canyon Lake (Texas) | 1,351.63 mi (2,175.23 km) |
| Potomac to Cape Coral (Florida) | 898.60 mi (1,446.15 km) |
| Potomac to Cape Girardeau (Missouri) | 681.42 mi (1,096.65 km) |
| Potomac to Carbondale (Illinois) | 657.24 mi (1,057.73 km) |
| Potomac to Carlisle (Pennsylvania) | 81.94 mi (131.87 km) |
