| Potomac to Lydney | 3,563.49 mi (5,734.89 km) |
| Potomac to Lye | 3,565.65 mi (5,738.36 km) |
| Potomac to Lymington | 3,624.32 mi (5,832.78 km) |
| Potomac to Lymm | 3,533.46 mi (5,686.56 km) |
| Potomac to Mablethorpe | 3,642.37 mi (5,861.83 km) |
| Potomac to Macclesfield | 3,549.68 mi (5,712.66 km) |
| Potomac to Mackworth | 3,579.56 mi (5,760.75 km) |
| Potomac to Madeley | 3,548.78 mi (5,711.21 km) |
| Potomac to Maesteg | 3,519.80 mi (5,664.57 km) |
| Potomac to Maghull | 3,512.36 mi (5,652.59 km) |
| Potomac to Maidenhead | 3,641.84 mi (5,860.98 km) |
| Potomac to Maidstone | 3,698.28 mi (5,951.81 km) |
| Potomac to Maldon | 3,693.84 mi (5,944.66 km) |
| Potomac to Maltby | 3,582.70 mi (5,765.79 km) |
| Potomac to Manchester | 3,540.76 mi (5,698.30 km) |
