| Potomac to Channelview (Texas) | 1,200.64 mi (1,932.24 km) |
| Potomac to Chantilly (Virginia) | 16.10 mi (25.91 km) |
| Potomac to Chaparral (New Mexico) | 1,703.36 mi (2,741.30 km) |
| Potomac to Chapel Hill (North Carolina) | 236.05 mi (379.89 km) |
| Potomac to Charleston (Illinois) | 588.23 mi (946.67 km) |
| Potomac to Charleston (South Carolina) | 455.40 mi (732.89 km) |
| Potomac to Charleston (West Virginia) | 243.72 mi (392.23 km) |
| Potomac to Charlotte (North Carolina) | 330.51 mi (531.91 km) |
| Potomac to Charlottesville (Virginia) | 97.08 mi (156.23 km) |
| Potomac to Chaska (Minnesota) | 932.06 mi (1,500.00 km) |
| Potomac to Chatham (Illinois) | 668.88 mi (1,076.46 km) |
| Potomac to Chattanooga (Tennessee) | 520.94 mi (838.37 km) |
| Potomac to Cheat Lake (West Virginia) | 149.23 mi (240.16 km) |
| Potomac to Chelsea (Alabama) | 656.22 mi (1,056.08 km) |
| Potomac to Chelsea (Massachusetts) | 398.27 mi (640.96 km) |
