| Porthcawl to Mauldin (South Carolina) | 3,925.70 mi (6,317.81 km) |
| Porthcawl to Maumee (Ohio) | 3,669.65 mi (5,905.73 km) |
| Porthcawl to Maumelle (Arkansas) | 4,332.32 mi (6,972.19 km) |
| Porthcawl to Mayagüez (Puerto Rico) | 4,105.16 mi (6,606.61 km) |
| Porthcawl to Mayfield Heights (Ohio) | 3,583.90 mi (5,767.74 km) |
| Porthcawl to Mays Chapel (Maryland) | 3,479.80 mi (5,600.19 km) |
| Porthcawl to Maywood (California) | 5,327.07 mi (8,573.09 km) |
| Porthcawl to Maywood (Illinois) | 3,819.66 mi (6,147.15 km) |
| Porthcawl to McAlester (Oklahoma) | 4,461.54 mi (7,180.15 km) |
| Porthcawl to McAllen (Texas) | 5,006.57 mi (8,057.30 km) |
| Porthcawl to McCalla (Alabama) | 4,191.42 mi (6,745.44 km) |
| Porthcawl to McComb (Mississippi) | 4,433.69 mi (7,135.33 km) |
| Porthcawl to McDonough (Georgia) | 4,066.18 mi (6,543.89 km) |
| Porthcawl to McFarland (California) | 5,266.63 mi (8,475.82 km) |
| Porthcawl to McHenry (Illinois) | 3,816.20 mi (6,141.58 km) |
