| Cities | Distance |
|---|---|
| Harpenden to Mitcham | 30.04 mi (48.35 km) |
| Harpenden to Mold | 149.53 mi (240.65 km) |
| Harpenden to Molesey | 28.78 mi (46.32 km) |
| Harpenden to Monkseaton | 227.46 mi (366.06 km) |
| Harpenden to Monmouth | 101.13 mi (162.75 km) |
| Harpenden to Montrose | 348.47 mi (560.80 km) |
| Harpenden to Morden | 29.53 mi (47.52 km) |
| Harpenden to Morecambe | 187.78 mi (302.21 km) |
| Harpenden to Moreton | 159.25 mi (256.28 km) |
| Harpenden to Morley | 143.32 mi (230.65 km) |
| Harpenden to Morpeth | 237.90 mi (382.86 km) |
| Harpenden to Morriston | 153.79 mi (247.50 km) |
| Harpenden to Mosbrough | 112.45 mi (180.98 km) |
| Harpenden to Mossley | 136.90 mi (220.32 km) |
| Harpenden to Moston | 140.21 mi (225.64 km) |