| Harpenden to Thornbury | 94.11 mi (151.45 km) |
| Harpenden to Thorne | 126.30 mi (203.27 km) |
| Harpenden to Thornton | 149.94 mi (241.31 km) |
| Harpenden to Thornton Heath | 30.67 mi (49.36 km) |
| Harpenden to Thorpe Saint Andrew | 91.33 mi (146.99 km) |
| Harpenden to Thundersley | 43.83 mi (70.54 km) |
| Harpenden to Tilbury | 39.20 mi (63.08 km) |
| Harpenden to Tilehurst | 38.58 mi (62.08 km) |
| Harpenden to Timperley | 136.49 mi (219.66 km) |
| Harpenden to Tipton | 87.89 mi (141.44 km) |
| Harpenden to Tiptree | 47.09 mi (75.79 km) |
| Harpenden to Tiverton | 149.29 mi (240.26 km) |
| Harpenden to Todmorden | 149.88 mi (241.20 km) |
| Harpenden to Tonbridge | 50.59 mi (81.41 km) |
| Harpenden to Tonypandy | 133.31 mi (214.55 km) |
