| Potomac to Southwater | 3,667.76 mi (5,902.69 km) |
| Potomac to Southwick | 3,546.78 mi (5,707.99 km) |
| Potomac to Southwick | 3,676.65 mi (5,917.00 km) |
| Potomac to Sowerby Bridge | 3,549.64 mi (5,712.59 km) |
| Potomac to Spalding | 3,637.63 mi (5,854.20 km) |
| Potomac to Spennymoor | 3,543.71 mi (5,703.06 km) |
| Potomac to Spitalfields | 3,668.16 mi (5,903.34 km) |
| Potomac to Spondon | 3,585.15 mi (5,769.74 km) |
| Potomac to Stafford | 3,558.76 mi (5,727.27 km) |
| Potomac to Staines-upon-Thames | 3,652.20 mi (5,877.64 km) |
| Potomac to Stalybridge | 3,548.80 mi (5,711.25 km) |
| Potomac to Stamford | 3,627.15 mi (5,837.33 km) |
| Potomac to Standish | 3,522.22 mi (5,668.46 km) |
| Potomac to Stanford le Hope | 3,688.54 mi (5,936.14 km) |
| Potomac to Stanley | 3,566.61 mi (5,739.91 km) |
