| Swansea to Maryland Heights (Missouri) | 28.84 mi (46.42 km) |
| Swansea to Marysville (California) | 1,692.08 mi (2,723.14 km) |
| Swansea to Marysville (Ohio) | 372.22 mi (599.03 km) |
| Swansea to Marysville (Washington) | 1,730.38 mi (2,784.78 km) |
| Swansea to Maryville (Missouri) | 288.47 mi (464.25 km) |
| Swansea to Maryville (Tennessee) | 383.24 mi (616.77 km) |
| Swansea to Mason (Ohio) | 310.36 mi (499.48 km) |
| Swansea to Mason City (Iowa) | 359.29 mi (578.22 km) |
| Swansea to Massapequa (New York) | 889.82 mi (1,432.02 km) |
| Swansea to Massapequa Park (New York) | 890.98 mi (1,433.90 km) |
| Swansea to Massillon (Ohio) | 475.45 mi (765.16 km) |
| Swansea to Mastic (New York) | 923.04 mi (1,485.48 km) |
| Swansea to Mastic Beach (New York) | 923.40 mi (1,486.07 km) |
| Swansea to Matteson (Illinois) | 236.25 mi (380.21 km) |
| Swansea to Matthews (North Carolina) | 564.71 mi (908.81 km) |
