| Potomac to Clemson (South Carolina) | 431.11 mi (693.81 km) |
| Potomac to Clermont (Florida) | 769.16 mi (1,237.85 km) |
| Potomac to Cleveland (Mississippi) | 835.12 mi (1,344.00 km) |
| Potomac to Cleveland (Ohio) | 291.34 mi (468.87 km) |
| Potomac to Cleveland (Tennessee) | 498.80 mi (802.74 km) |
| Potomac to Cleveland Heights (Ohio) | 287.75 mi (463.10 km) |
| Potomac to Cliffside Park (New Jersey) | 210.87 mi (339.37 km) |
| Potomac to Clifton (Colorado) | 1,669.39 mi (2,686.62 km) |
| Potomac to Clifton (New Jersey) | 205.41 mi (330.57 km) |
| Potomac to Clinton (Iowa) | 712.69 mi (1,146.96 km) |
| Potomac to Clinton (Maryland) | 23.94 mi (38.53 km) |
| Potomac to Clinton (Mississippi) | 868.14 mi (1,397.14 km) |
| Potomac to Clinton (Utah) | 1,837.13 mi (2,956.57 km) |
| Potomac to Clive (Iowa) | 891.52 mi (1,434.76 km) |
| Potomac to Cloquet (Minnesota) | 937.48 mi (1,508.73 km) |
