| Potomac to Camarillo (California) | 2,323.10 mi (3,738.67 km) |
| Potomac to Camas (Washington) | 2,323.92 mi (3,739.98 km) |
| Potomac to Cambridge (Maryland) | 68.06 mi (109.53 km) |
| Potomac to Cambridge (Massachusetts) | 393.86 mi (633.86 km) |
| Potomac to Camden (Arkansas) | 947.80 mi (1,525.34 km) |
| Potomac to Camden (New Jersey) | 128.24 mi (206.39 km) |
| Potomac to Cameron Park (California) | 2,333.45 mi (3,755.33 km) |
| Potomac to Camp Pendleton South (California) | 2,260.08 mi (3,637.25 km) |
| Potomac to Camp Springs (Maryland) | 20.64 mi (33.22 km) |
| Potomac to Camp Verde (Arizona) | 1,930.44 mi (3,106.75 km) |
| Potomac to Campbell (California) | 2,410.37 mi (3,879.11 km) |
| Potomac to Campbellsville (Kentucky) | 457.61 mi (736.45 km) |
| Potomac to Campton Hills (Illinois) | 623.10 mi (1,002.79 km) |
| Potomac to Canby (Oregon) | 2,338.49 mi (3,763.44 km) |
| Potomac to Candelaria (Puerto Rico) | 1,568.70 mi (2,524.58 km) |
