| Porthcawl to McKeesport (Pennsylvania) | 3,570.62 mi (5,746.36 km) |
| Porthcawl to McKinleyville (California) | 5,116.50 mi (8,234.21 km) |
| Porthcawl to McKinney (Texas) | 4,583.42 mi (7,376.30 km) |
| Porthcawl to McLean (Virginia) | 3,523.80 mi (5,671.00 km) |
| Porthcawl to McMinnville (Oregon) | 4,848.39 mi (7,802.73 km) |
| Porthcawl to McMinnville (Tennessee) | 4,025.64 mi (6,478.64 km) |
| Porthcawl to McNair (Virginia) | 3,532.42 mi (5,684.88 km) |
| Porthcawl to McPherson (Kansas) | 4,362.32 mi (7,020.47 km) |
| Porthcawl to Mead Valley (California) | 5,305.57 mi (8,538.48 km) |
| Porthcawl to Meadow Woods (Florida) | 4,196.13 mi (6,753.02 km) |
| Porthcawl to Meadowbrook (Virginia) | 3,603.00 mi (5,798.46 km) |
| Porthcawl to Meadville (Pennsylvania) | 3,525.81 mi (5,674.25 km) |
| Porthcawl to Mebane (North Carolina) | 3,739.16 mi (6,017.60 km) |
| Porthcawl to Mechanicsville (Virginia) | 3,589.26 mi (5,776.35 km) |
| Porthcawl to Medford (Massachusetts) | 3,124.67 mi (5,028.68 km) |
