| Potomac to Cold Springs (Nevada) | 2,264.18 mi (3,643.84 km) |
| Potomac to Coldwater (Michigan) | 457.23 mi (735.84 km) |
| Potomac to Colesville (Maryland) | 11.14 mi (17.93 km) |
| Potomac to College (Alaska) | 3,261.54 mi (5,248.93 km) |
| Potomac to College Park (Georgia) | 549.03 mi (883.58 km) |
| Potomac to College Park (Maryland) | 14.05 mi (22.61 km) |
| Potomac to College Station (Texas) | 1,226.75 mi (1,974.27 km) |
| Potomac to Collegedale (Tennessee) | 512.15 mi (824.22 km) |
| Potomac to Colleyville (Texas) | 1,190.44 mi (1,915.83 km) |
| Potomac to Collierville (Tennessee) | 741.38 mi (1,193.13 km) |
| Potomac to Collinsville (Illinois) | 689.27 mi (1,109.27 km) |
| Potomac to Colonia (New Jersey) | 187.75 mi (302.15 km) |
| Potomac to Colonial Heights (Virginia) | 121.35 mi (195.30 km) |
| Potomac to Colonial Park (Pennsylvania) | 91.12 mi (146.64 km) |
| Potomac to Colorado Springs (Colorado) | 1,475.74 mi (2,374.97 km) |
