| Potomac to Mansfield | 3,588.81 mi (5,775.63 km) |
| Potomac to March | 3,652.22 mi (5,877.68 km) |
| Potomac to Margate | 3,730.47 mi (6,003.62 km) |
| Potomac to Market Drayton | 3,542.15 mi (5,700.53 km) |
| Potomac to Market Harborough | 3,613.38 mi (5,815.17 km) |
| Potomac to Marlow | 3,638.26 mi (5,855.21 km) |
| Potomac to Marple | 3,549.61 mi (5,712.55 km) |
| Potomac to Marton | 3,561.58 mi (5,731.80 km) |
| Potomac to Maryport | 3,470.01 mi (5,584.44 km) |
| Potomac to Matlock | 3,574.86 mi (5,753.18 km) |
| Potomac to Melksham | 3,586.83 mi (5,772.45 km) |
| Potomac to Meltham | 3,554.24 mi (5,720.00 km) |
| Potomac to Melton Mowbray | 3,608.81 mi (5,807.82 km) |
| Potomac to Merthyr Tudful | 3,528.39 mi (5,678.39 km) |
| Potomac to Methil | 3,464.10 mi (5,574.93 km) |
