| Potomac to Conyers (Georgia) | 528.78 mi (851.00 km) |
| Potomac to Cookeville (Tennessee) | 496.31 mi (798.74 km) |
| Potomac to Coolidge (Arizona) | 1,952.84 mi (3,142.79 km) |
| Potomac to Coon Rapids (Minnesota) | 927.13 mi (1,492.07 km) |
| Potomac to Cooper City (Florida) | 913.74 mi (1,470.53 km) |
| Potomac to Coos Bay (Oregon) | 2,431.48 mi (3,913.09 km) |
| Potomac to Copiague (New York) | 231.88 mi (373.18 km) |
| Potomac to Coppell (Texas) | 1,179.98 mi (1,899.00 km) |
| Potomac to Copperas Cove (Texas) | 1,288.47 mi (2,073.59 km) |
| Potomac to Coral Gables (Florida) | 936.86 mi (1,507.73 km) |
| Potomac to Coral Springs (Florida) | 898.23 mi (1,445.56 km) |
| Potomac to Coral Terrace (Florida) | 934.33 mi (1,503.66 km) |
| Potomac to Coralville (Iowa) | 779.63 mi (1,254.70 km) |
| Potomac to Coram (New York) | 256.59 mi (412.95 km) |
| Potomac to Corcoran (California) | 2,308.74 mi (3,715.56 km) |
