| Potomac to Carlsbad (California) | 2,257.00 mi (3,632.29 km) |
| Potomac to Carlsbad (New Mexico) | 1,577.89 mi (2,539.37 km) |
| Potomac to Carmel (Indiana) | 481.61 mi (775.08 km) |
| Potomac to Carmichael (California) | 2,351.88 mi (3,784.99 km) |
| Potomac to Carney (Maryland) | 44.93 mi (72.32 km) |
| Potomac to Carnot-Moon (Pennsylvania) | 191.27 mi (307.82 km) |
| Potomac to Carol Stream (Illinois) | 608.35 mi (979.05 km) |
| Potomac to Carolina (Puerto Rico) | 1,574.67 mi (2,534.18 km) |
| Potomac to Carolina Forest (South Carolina) | 375.04 mi (603.56 km) |
| Potomac to Carpentersville (Illinois) | 620.11 mi (997.97 km) |
| Potomac to Carpinteria (California) | 2,344.55 mi (3,773.18 km) |
| Potomac to Carrboro (North Carolina) | 237.28 mi (381.87 km) |
| Potomac to Carroll (Iowa) | 949.65 mi (1,528.32 km) |
| Potomac to Carrollton (Georgia) | 577.41 mi (929.25 km) |
| Potomac to Carrollton (Texas) | 1,174.52 mi (1,890.21 km) |
