| Swansea to Mattoon (Illinois) | 108.15 mi (174.04 km) |
| Swansea to Mauldin (South Carolina) | 498.82 mi (802.77 km) |
| Swansea to Maumee (Ohio) | 393.90 mi (633.92 km) |
| Swansea to Maumelle (Arkansas) | 288.39 mi (464.12 km) |
| Swansea to Mayagüez (Puerto Rico) | 1,965.14 mi (3,162.59 km) |
| Swansea to Mayfield Heights (Ohio) | 495.44 mi (797.34 km) |
| Swansea to Mays Chapel (Maryland) | 718.00 mi (1,155.51 km) |
| Swansea to Maywood (California) | 1,595.73 mi (2,568.08 km) |
| Swansea to Maywood (Illinois) | 256.25 mi (412.39 km) |
| Swansea to McAlester (Oklahoma) | 406.57 mi (654.32 km) |
| Swansea to McAllen (Texas) | 977.47 mi (1,573.09 km) |
| Swansea to McCalla (Alabama) | 398.49 mi (641.31 km) |
| Swansea to McComb (Mississippi) | 505.58 mi (813.65 km) |
| Swansea to McDonough (Georgia) | 480.52 mi (773.32 km) |
| Swansea to McFarland (California) | 1,617.19 mi (2,602.61 km) |
