| Potomac to Central Point (Oregon) | 2,377.24 mi (3,825.80 km) |
| Potomac to Centralia (Illinois) | 643.06 mi (1,034.90 km) |
| Potomac to Centralia (Washington) | 2,343.61 mi (3,771.68 km) |
| Potomac to Centreville (Virginia) | 17.87 mi (28.75 km) |
| Potomac to Ceres (California) | 2,352.00 mi (3,785.18 km) |
| Potomac to Cerritos (California) | 2,280.26 mi (3,669.72 km) |
| Potomac to Chalco (Nebraska) | 1,010.16 mi (1,625.69 km) |
| Potomac to Chalmette (Louisiana) | 958.39 mi (1,542.39 km) |
| Potomac to Chambersburg (Pennsylvania) | 67.99 mi (109.42 km) |
| Potomac to Chamblee (Georgia) | 530.35 mi (853.52 km) |
| Potomac to Champaign (Illinois) | 594.62 mi (956.95 km) |
| Potomac to Champlin (Minnesota) | 930.66 mi (1,497.75 km) |
| Potomac to Chandler (Arizona) | 1,961.39 mi (3,156.55 km) |
| Potomac to Chanhassen (Minnesota) | 930.79 mi (1,497.96 km) |
| Potomac to Channahon (Illinois) | 606.54 mi (976.14 km) |
