| Potomac to San Luis Obispo (California) | 2,385.75 mi (3,839.50 km) |
| Potomac to San Marcos (California) | 2,250.88 mi (3,622.44 km) |
| Potomac to San Marcos (Texas) | 1,335.49 mi (2,149.26 km) |
| Potomac to San Marino (California) | 2,276.39 mi (3,663.50 km) |
| Potomac to San Mateo (California) | 2,423.75 mi (3,900.65 km) |
| Potomac to San Pablo (California) | 2,417.34 mi (3,890.33 km) |
| Potomac to San Rafael (California) | 2,426.20 mi (3,904.59 km) |
| Potomac to San Ramon (California) | 2,399.93 mi (3,862.31 km) |
| Potomac to San Tan Valley (Arizona) | 1,948.57 mi (3,135.91 km) |
| Potomac to Sand Springs (Oklahoma) | 1,053.71 mi (1,695.78 km) |
| Potomac to Sandusky (Ohio) | 335.57 mi (540.04 km) |
| Potomac to Sandy (Oregon) | 2,317.44 mi (3,729.56 km) |
| Potomac to Sandy (Utah) | 1,831.14 mi (2,946.93 km) |
| Potomac to Sandy Springs (Georgia) | 530.74 mi (854.14 km) |
| Potomac to Sanford (Florida) | 744.01 mi (1,197.36 km) |
