| Potomac to Clarksdale (Mississippi) | 812.13 mi (1,307.00 km) |
| Potomac to Clarkston (Georgia) | 531.37 mi (855.16 km) |
| Potomac to Clarksville (Indiana) | 464.77 mi (747.98 km) |
| Potomac to Clarksville (Tennessee) | 578.84 mi (931.55 km) |
| Potomac to Clawson (Michigan) | 395.25 mi (636.09 km) |
| Potomac to Clay (Alabama) | 639.36 mi (1,028.95 km) |
| Potomac to Clayton (California) | 2,396.17 mi (3,856.27 km) |
| Potomac to Clayton (Missouri) | 706.89 mi (1,137.63 km) |
| Potomac to Clayton (North Carolina) | 241.85 mi (389.22 km) |
| Potomac to Clayton (Ohio) | 385.16 mi (619.85 km) |
| Potomac to Clearfield (Utah) | 1,835.28 mi (2,953.59 km) |
| Potomac to Clearlake (California) | 2,414.11 mi (3,885.13 km) |
| Potomac to Clearwater (Florida) | 826.74 mi (1,330.50 km) |
| Potomac to Cleburne (Texas) | 1,221.08 mi (1,965.14 km) |
| Potomac to Clemmons (North Carolina) | 270.23 mi (434.90 km) |
