| Holyhead to Monticello (Minnesota) | 3,788.06 mi (6,096.29 km) |
| Holyhead to Montrose (Colorado) | 4,624.64 mi (7,442.64 km) |
| Holyhead to Moody (Alabama) | 4,080.51 mi (6,566.95 km) |
| Holyhead to Moore (Oklahoma) | 4,416.88 mi (7,108.29 km) |
| Holyhead to Moorestown-Lenola (New Jersey) | 3,316.11 mi (5,336.76 km) |
| Holyhead to Mooresville (North Carolina) | 3,756.48 mi (6,045.47 km) |
| Holyhead to Moorhead (Minnesota) | 3,816.81 mi (6,142.57 km) |
| Holyhead to Moorpark (California) | 5,222.18 mi (8,404.29 km) |
| Holyhead to Moraga (California) | 5,118.97 mi (8,238.19 km) |
| Holyhead to Moreno Valley (California) | 5,188.55 mi (8,350.16 km) |
| Holyhead to Morgan City (Louisiana) | 4,465.37 mi (7,186.31 km) |
| Holyhead to Morgan Hill (California) | 5,145.42 mi (8,280.76 km) |
| Holyhead to Morganton (North Carolina) | 3,783.91 mi (6,089.62 km) |
| Holyhead to Morgantown (West Virginia) | 3,529.46 mi (5,680.12 km) |
| Holyhead to Morris (Illinois) | 3,776.45 mi (6,077.62 km) |
