| Llantwit Major to Mendota Heights (Minnesota) | 3,893.46 mi (6,265.93 km) |
| Llantwit Major to Menifee (California) | 5,320.58 mi (8,562.64 km) |
| Llantwit Major to Menlo Park (California) | 5,268.06 mi (8,478.13 km) |
| Llantwit Major to Menomonee Falls (Wisconsin) | 3,783.68 mi (6,089.24 km) |
| Llantwit Major to Menomonie (Wisconsin) | 3,847.76 mi (6,192.37 km) |
| Llantwit Major to Mentor (Ohio) | 3,582.19 mi (5,764.98 km) |
| Llantwit Major to Mequon (Wisconsin) | 3,774.48 mi (6,074.44 km) |
| Llantwit Major to Merced (California) | 5,224.58 mi (8,408.15 km) |
| Llantwit Major to Mercedes (Texas) | 5,007.30 mi (8,058.47 km) |
| Llantwit Major to Mercer Island (Washington) | 4,699.38 mi (7,562.93 km) |
| Llantwit Major to Mercerville (New Jersey) | 3,374.39 mi (5,430.56 km) |
| Llantwit Major to Meriden (Connecticut) | 3,241.03 mi (5,215.94 km) |
| Llantwit Major to Meridian (Idaho) | 4,746.92 mi (7,639.43 km) |
| Llantwit Major to Meridian (Mississippi) | 4,314.69 mi (6,943.82 km) |
| Llantwit Major to Merriam (Kansas) | 4,228.47 mi (6,805.07 km) |
