| Potomac to Thornaby on Tees | 3,557.40 mi (5,725.09 km) |
| Potomac to Thornbury | 3,566.05 mi (5,739.00 km) |
| Potomac to Thorne | 3,589.02 mi (5,775.97 km) |
| Potomac to Thornton | 3,550.48 mi (5,713.94 km) |
| Potomac to Thornton Heath | 3,669.37 mi (5,905.29 km) |
| Potomac to Thorpe Saint Andrew | 3,700.35 mi (5,955.14 km) |
| Potomac to Thundersley | 3,694.01 mi (5,944.93 km) |
| Potomac to Tilbury | 3,687.05 mi (5,933.74 km) |
| Potomac to Tilehurst | 3,630.02 mi (5,841.96 km) |
| Potomac to Timperley | 3,539.22 mi (5,695.83 km) |
| Potomac to Tipton | 3,565.97 mi (5,738.88 km) |
| Potomac to Tiptree | 3,695.08 mi (5,946.65 km) |
| Potomac to Tiverton | 3,540.51 mi (5,697.91 km) |
| Potomac to Todmorden | 3,542.26 mi (5,700.72 km) |
| Potomac to Tonbridge | 3,689.62 mi (5,937.88 km) |
