| Swansea to McHenry (Illinois) | 276.43 mi (444.87 km) |
| Swansea to McKeesport (Pennsylvania) | 554.75 mi (892.78 km) |
| Swansea to McKinleyville (California) | 1,807.51 mi (2,908.91 km) |
| Swansea to McKinney (Texas) | 525.54 mi (845.77 km) |
| Swansea to McLean (Virginia) | 689.26 mi (1,109.26 km) |
| Swansea to McMinnville (Oregon) | 1,755.45 mi (2,825.12 km) |
| Swansea to McMinnville (Tennessee) | 304.61 mi (490.22 km) |
| Swansea to McNair (Virginia) | 677.58 mi (1,090.46 km) |
| Swansea to McPherson (Kansas) | 415.28 mi (668.33 km) |
| Swansea to Mead Valley (California) | 1,550.67 mi (2,495.57 km) |
| Swansea to Meadow Woods (Florida) | 860.90 mi (1,385.48 km) |
| Swansea to Meadowbrook (Virginia) | 685.15 mi (1,102.65 km) |
| Swansea to Meadville (Pennsylvania) | 561.88 mi (904.26 km) |
| Swansea to Mebane (North Carolina) | 612.35 mi (985.49 km) |
| Swansea to Mechanicsville (Virginia) | 689.22 mi (1,109.20 km) |
