| Potomac to Superior (Colorado) | 1,486.71 mi (2,392.62 km) |
| Potomac to Superior (Wisconsin) | 919.62 mi (1,479.99 km) |
| Potomac to Surprise (Arizona) | 1,983.58 mi (3,192.27 km) |
| Potomac to Susanville (California) | 2,286.21 mi (3,679.30 km) |
| Potomac to Sussex (Wisconsin) | 640.40 mi (1,030.62 km) |
| Potomac to Suwanee (Georgia) | 512.79 mi (825.25 km) |
| Potomac to Swansea (Illinois) | 689.13 mi (1,109.05 km) |
| Potomac to Sweetwater (Florida) | 932.96 mi (1,501.45 km) |
| Potomac to Sweetwater (Texas) | 1,373.58 mi (2,210.57 km) |
| Potomac to Sycamore (Illinois) | 637.09 mi (1,025.30 km) |
| Potomac to Sylacauga (Alabama) | 646.56 mi (1,040.53 km) |
| Potomac to Sylvania (Ohio) | 390.15 mi (627.88 km) |
| Potomac to Syosset (New York) | 231.88 mi (373.17 km) |
| Potomac to Syracuse (New York) | 283.54 mi (456.32 km) |
| Potomac to Syracuse (Utah) | 1,837.80 mi (2,957.65 km) |
