| Holyhead to Mendota Heights (Minnesota) | 3,784.22 mi (6,090.11 km) |
| Holyhead to Menifee (California) | 5,201.15 mi (8,370.45 km) |
| Holyhead to Menlo Park (California) | 5,141.97 mi (8,275.21 km) |
| Holyhead to Menomonee Falls (Wisconsin) | 3,681.71 mi (5,925.14 km) |
| Holyhead to Menomonie (Wisconsin) | 3,739.61 mi (6,018.31 km) |
| Holyhead to Mentor (Ohio) | 3,489.93 mi (5,616.50 km) |
| Holyhead to Mequon (Wisconsin) | 3,672.52 mi (5,910.35 km) |
| Holyhead to Merced (California) | 5,099.86 mi (8,207.42 km) |
| Holyhead to Mercedes (Texas) | 4,917.38 mi (7,913.76 km) |
| Holyhead to Mercer Island (Washington) | 4,567.46 mi (7,350.62 km) |
| Holyhead to Mercerville (New Jersey) | 3,293.02 mi (5,299.61 km) |
| Holyhead to Meriden (Connecticut) | 3,159.35 mi (5,084.48 km) |
| Holyhead to Meridian (Idaho) | 4,620.81 mi (7,436.48 km) |
| Holyhead to Meridian (Mississippi) | 4,228.63 mi (6,805.32 km) |
| Holyhead to Merriam (Kansas) | 4,125.70 mi (6,639.67 km) |
