| Porthcawl to Mendota Heights (Minnesota) | 3,882.91 mi (6,248.93 km) |
| Porthcawl to Menifee (California) | 5,310.16 mi (8,545.87 km) |
| Porthcawl to Menlo Park (California) | 5,257.87 mi (8,461.72 km) |
| Porthcawl to Menomonee Falls (Wisconsin) | 3,773.11 mi (6,072.24 km) |
| Porthcawl to Menomonie (Wisconsin) | 3,837.20 mi (6,175.37 km) |
| Porthcawl to Mentor (Ohio) | 3,571.70 mi (5,748.10 km) |
| Porthcawl to Mequon (Wisconsin) | 3,763.92 mi (6,057.44 km) |
| Porthcawl to Merced (California) | 5,214.33 mi (8,391.65 km) |
| Porthcawl to Mercedes (Texas) | 4,996.85 mi (8,041.66 km) |
| Porthcawl to Mercer Island (Washington) | 4,689.55 mi (7,547.09 km) |
| Porthcawl to Mercerville (New Jersey) | 3,364.08 mi (5,413.96 km) |
| Porthcawl to Meriden (Connecticut) | 3,230.71 mi (5,199.33 km) |
| Porthcawl to Meridian (Idaho) | 4,736.73 mi (7,623.03 km) |
| Porthcawl to Meridian (Mississippi) | 4,304.30 mi (6,927.10 km) |
| Porthcawl to Merriam (Kansas) | 4,217.91 mi (6,788.06 km) |
