| Potomac to Storm Lake (Iowa) | 971.87 mi (1,564.07 km) |
| Potomac to Storrs (Connecticut) | 323.78 mi (521.07 km) |
| Potomac to Stoughton (Wisconsin) | 682.36 mi (1,098.15 km) |
| Potomac to Stow (Ohio) | 269.29 mi (433.39 km) |
| Potomac to Streamwood (Illinois) | 612.63 mi (985.94 km) |
| Potomac to Streator (Illinois) | 631.73 mi (1,016.67 km) |
| Potomac to Streetsboro (Ohio) | 267.80 mi (430.98 km) |
| Potomac to Strongsville (Ohio) | 291.78 mi (469.57 km) |
| Potomac to Stuart (Florida) | 835.27 mi (1,344.24 km) |
| Potomac to Stuarts Draft (Virginia) | 120.97 mi (194.69 km) |
| Potomac to Sturgis (Michigan) | 473.28 mi (761.67 km) |
| Potomac to Suamico (Wisconsin) | 680.47 mi (1,095.11 km) |
| Potomac to Sudley (Virginia) | 22.53 mi (36.27 km) |
| Potomac to Suffern (New York) | 216.98 mi (349.20 km) |
| Potomac to Suffolk (Virginia) | 163.04 mi (262.39 km) |
