| Potomac to South Plainfield (New Jersey) | 182.73 mi (294.07 km) |
| Potomac to South Portland (Maine) | 479.41 mi (771.53 km) |
| Potomac to South Riding (Virginia) | 18.53 mi (29.82 km) |
| Potomac to South River (New Jersey) | 179.35 mi (288.64 km) |
| Potomac to South Salt Lake (Utah) | 1,832.35 mi (2,948.88 km) |
| Potomac to South San Francisco (California) | 2,427.38 mi (3,906.49 km) |
| Potomac to South San Jose Hills (California) | 2,267.90 mi (3,649.83 km) |
| Potomac to South Sioux City (Nebraska) | 1,031.49 mi (1,660.03 km) |
| Potomac to South St. Paul (Minnesota) | 907.69 mi (1,460.78 km) |
| Potomac to South Valley (New Mexico) | 1,642.85 mi (2,643.90 km) |
| Potomac to South Venice (Florida) | 880.16 mi (1,416.47 km) |
| Potomac to South Whittier (California) | 2,276.63 mi (3,663.88 km) |
| Potomac to South Yarmouth (Massachusetts) | 411.29 mi (661.91 km) |
| Potomac to Southaven (Mississippi) | 758.52 mi (1,220.72 km) |
| Potomac to Southchase (Florida) | 773.11 mi (1,244.20 km) |
