| Potomac to Cullman (Alabama) | 630.34 mi (1,014.43 km) |
| Potomac to Culpeper (Virginia) | 57.42 mi (92.41 km) |
| Potomac to Culver City (California) | 2,294.43 mi (3,692.52 km) |
| Potomac to Cumberland (Maryland) | 94.48 mi (152.05 km) |
| Potomac to Cupertino (California) | 2,414.51 mi (3,885.77 km) |
| Potomac to Cutler Bay (Florida) | 946.22 mi (1,522.80 km) |
| Potomac to Cutlerville (Michigan) | 515.19 mi (829.12 km) |
| Potomac to Cuyahoga Falls (Ohio) | 272.65 mi (438.79 km) |
| Potomac to Cypress (California) | 2,279.91 mi (3,669.16 km) |
| Potomac to Cypress Gardens (Florida) | 803.25 mi (1,292.70 km) |
| Potomac to Cypress Lake (Florida) | 903.87 mi (1,454.63 km) |
| Potomac to D'Iberville (Mississippi) | 887.52 mi (1,428.33 km) |
| Potomac to Dakota Ridge (Colorado) | 1,488.07 mi (2,394.82 km) |
| Potomac to Dale City (Virginia) | 26.62 mi (42.85 km) |
| Potomac to Dallas (Georgia) | 551.61 mi (887.73 km) |
