| Porthcawl to Marysville (California) | 5,144.15 mi (8,278.71 km) |
| Porthcawl to Marysville (Ohio) | 3,717.45 mi (5,982.66 km) |
| Porthcawl to Marysville (Washington) | 4,658.79 mi (7,497.60 km) |
| Porthcawl to Maryville (Missouri) | 4,160.62 mi (6,695.86 km) |
| Porthcawl to Maryville (Tennessee) | 3,949.17 mi (6,355.58 km) |
| Porthcawl to Mason (Ohio) | 3,794.69 mi (6,106.97 km) |
| Porthcawl to Mason City (Iowa) | 3,965.06 mi (6,381.15 km) |
| Porthcawl to Massapequa (New York) | 3,295.15 mi (5,303.03 km) |
| Porthcawl to Massapequa Park (New York) | 3,293.68 mi (5,300.67 km) |
| Porthcawl to Massillon (Ohio) | 3,619.06 mi (5,824.32 km) |
| Porthcawl to Mastic (New York) | 3,263.35 mi (5,251.86 km) |
| Porthcawl to Mastic Beach (New York) | 3,264.71 mi (5,254.05 km) |
| Porthcawl to Matteson (Illinois) | 3,832.72 mi (6,168.16 km) |
| Porthcawl to Matthews (North Carolina) | 3,843.75 mi (6,185.93 km) |
| Porthcawl to Mattoon (Illinois) | 3,950.49 mi (6,357.69 km) |
