| Llanelli to McKeesport (Pennsylvania) | 3,546.81 mi (5,708.05 km) |
| Llanelli to McKinleyville (California) | 5,092.36 mi (8,195.36 km) |
| Llanelli to McKinney (Texas) | 4,559.13 mi (7,337.22 km) |
| Llanelli to McLean (Virginia) | 3,500.37 mi (5,633.31 km) |
| Llanelli to McMinnville (Oregon) | 4,824.45 mi (7,764.20 km) |
| Llanelli to McMinnville (Tennessee) | 4,001.88 mi (6,440.41 km) |
| Llanelli to McNair (Virginia) | 3,508.98 mi (5,647.16 km) |
| Llanelli to McPherson (Kansas) | 4,337.74 mi (6,980.92 km) |
| Llanelli to Mead Valley (California) | 5,280.90 mi (8,498.78 km) |
| Llanelli to Meadow Woods (Florida) | 4,173.76 mi (6,717.02 km) |
| Llanelli to Meadowbrook (Virginia) | 3,579.76 mi (5,761.07 km) |
| Llanelli to Meadville (Pennsylvania) | 3,501.84 mi (5,635.67 km) |
| Llanelli to Mebane (North Carolina) | 3,715.93 mi (5,980.22 km) |
| Llanelli to Mechanicsville (Virginia) | 3,566.01 mi (5,738.93 km) |
| Llanelli to Medford (Massachusetts) | 3,101.27 mi (4,991.01 km) |
