| Holyhead to Mitchell (South Dakota) | 4,013.18 mi (6,458.59 km) |
| Holyhead to Mitchellville (Maryland) | 3,437.24 mi (5,531.71 km) |
| Holyhead to Moberly (Missouri) | 4,021.69 mi (6,472.29 km) |
| Holyhead to Mobile (Alabama) | 4,292.85 mi (6,908.67 km) |
| Holyhead to Modesto (California) | 5,096.93 mi (8,202.71 km) |
| Holyhead to Mokena (Illinois) | 3,748.13 mi (6,032.03 km) |
| Holyhead to Moline (Illinois) | 3,848.76 mi (6,193.98 km) |
| Holyhead to Moncks Corner (South Carolina) | 3,841.37 mi (6,182.10 km) |
| Holyhead to Monfort Heights (Ohio) | 3,733.70 mi (6,008.82 km) |
| Holyhead to Monmouth (Oregon) | 4,748.70 mi (7,642.29 km) |
| Holyhead to Monroe (Georgia) | 3,959.72 mi (6,372.55 km) |
| Holyhead to Monroe (Louisiana) | 4,354.94 mi (7,008.59 km) |
| Holyhead to Monroe (Michigan) | 3,558.87 mi (5,727.45 km) |
| Holyhead to Monroe (North Carolina) | 3,773.80 mi (6,073.35 km) |
| Holyhead to Monroe (Ohio) | 3,711.84 mi (5,973.63 km) |
