| Potomac to Mirfield | 3,558.90 mi (5,727.49 km) |
| Potomac to Mitcham | 3,667.60 mi (5,902.43 km) |
| Potomac to Mold | 3,511.32 mi (5,650.92 km) |
| Potomac to Molesey | 3,658.97 mi (5,888.54 km) |
| Potomac to Monkseaton | 3,542.51 mi (5,701.13 km) |
| Potomac to Monmouth | 3,554.02 mi (5,719.65 km) |
| Potomac to Montrose | 3,476.55 mi (5,594.96 km) |
| Potomac to Morden | 3,665.82 mi (5,899.57 km) |
| Potomac to Morecambe | 3,505.30 mi (5,641.23 km) |
| Potomac to Moreton | 3,507.89 mi (5,645.40 km) |
| Potomac to Morley | 3,560.99 mi (5,730.86 km) |
| Potomac to Morpeth | 3,531.44 mi (5,683.30 km) |
| Potomac to Morriston | 3,506.85 mi (5,643.72 km) |
| Potomac to Mosbrough | 3,578.68 mi (5,759.32 km) |
| Potomac to Mossley | 3,548.26 mi (5,710.37 km) |
