| Harpenden to Tadley | 46.66 mi (75.09 km) |
| Harpenden to Tadworth | 36.48 mi (58.71 km) |
| Harpenden to Tamworth | 80.02 mi (128.78 km) |
| Harpenden to Taunton | 130.60 mi (210.19 km) |
| Harpenden to Tavistock | 186.47 mi (300.10 km) |
| Harpenden to Teignmouth | 161.53 mi (259.96 km) |
| Harpenden to Telford | 106.64 mi (171.62 km) |
| Harpenden to Tewkesbury | 77.97 mi (125.48 km) |
| Harpenden to Thame | 26.81 mi (43.14 km) |
| Harpenden to Thames Ditton | 29.62 mi (47.67 km) |
| Harpenden to Thatcham | 48.40 mi (77.88 km) |
| Harpenden to Thatto Heath | 150.28 mi (241.85 km) |
| Harpenden to The Mumbles | 157.08 mi (252.79 km) |
| Harpenden to Thetford | 61.84 mi (99.52 km) |
| Harpenden to Thornaby on Tees | 193.42 mi (311.28 km) |
