| Cwmbran to McKeesport (Pennsylvania) | 3,593.71 mi (5,783.51 km) |
| Cwmbran to McKinleyville (California) | 5,127.07 mi (8,251.23 km) |
| Cwmbran to McKinney (Texas) | 4,604.66 mi (7,410.48 km) |
| Cwmbran to McLean (Virginia) | 3,547.95 mi (5,709.88 km) |
| Cwmbran to McMinnville (Oregon) | 4,857.96 mi (7,818.13 km) |
| Cwmbran to McMinnville (Tennessee) | 4,048.88 mi (6,516.05 km) |
| Cwmbran to McNair (Virginia) | 3,556.53 mi (5,723.68 km) |
| Cwmbran to McPherson (Kansas) | 4,381.68 mi (7,051.64 km) |
| Cwmbran to Mead Valley (California) | 5,320.48 mi (8,562.48 km) |
| Cwmbran to Meadow Woods (Florida) | 4,222.35 mi (6,795.22 km) |
| Cwmbran to Meadowbrook (Virginia) | 3,627.59 mi (5,838.04 km) |
| Cwmbran to Meadville (Pennsylvania) | 3,548.35 mi (5,710.52 km) |
| Cwmbran to Mebane (North Carolina) | 3,763.78 mi (6,057.21 km) |
| Cwmbran to Mechanicsville (Virginia) | 3,613.81 mi (5,815.87 km) |
| Cwmbran to Medford (Massachusetts) | 3,148.88 mi (5,067.63 km) |
