| Llanelli to Marysville (California) | 5,119.78 mi (8,239.49 km) |
| Llanelli to Marysville (Ohio) | 3,693.42 mi (5,943.98 km) |
| Llanelli to Marysville (Washington) | 4,634.98 mi (7,459.27 km) |
| Llanelli to Maryville (Missouri) | 4,136.05 mi (6,656.33 km) |
| Llanelli to Maryville (Tennessee) | 3,925.56 mi (6,317.58 km) |
| Llanelli to Mason (Ohio) | 3,770.68 mi (6,068.33 km) |
| Llanelli to Mason City (Iowa) | 3,940.44 mi (6,341.52 km) |
| Llanelli to Massapequa (New York) | 3,271.81 mi (5,265.47 km) |
| Llanelli to Massapequa Park (New York) | 3,270.35 mi (5,263.11 km) |
| Llanelli to Massillon (Ohio) | 3,595.09 mi (5,785.74 km) |
| Llanelli to Mastic (New York) | 3,240.05 mi (5,214.35 km) |
| Llanelli to Mastic Beach (New York) | 3,241.42 mi (5,216.56 km) |
| Llanelli to Matteson (Illinois) | 3,808.35 mi (6,128.95 km) |
| Llanelli to Matthews (North Carolina) | 3,820.51 mi (6,148.52 km) |
| Llanelli to Mattoon (Illinois) | 3,926.23 mi (6,318.65 km) |
