| Rhondda to Marysville (California) | 5,145.86 mi (8,281.46 km) |
| Rhondda to Marysville (Ohio) | 3,724.91 mi (5,994.66 km) |
| Rhondda to Marysville (Washington) | 4,658.97 mi (7,497.89 km) |
| Rhondda to Maryville (Missouri) | 4,166.39 mi (6,705.16 km) |
| Rhondda to Maryville (Tennessee) | 3,957.44 mi (6,368.89 km) |
| Rhondda to Mason (Ohio) | 3,802.20 mi (6,119.05 km) |
| Rhondda to Mason City (Iowa) | 3,970.50 mi (6,389.90 km) |
| Rhondda to Massapequa (New York) | 3,303.86 mi (5,317.06 km) |
| Rhondda to Massapequa Park (New York) | 3,302.40 mi (5,314.70 km) |
| Rhondda to Massillon (Ohio) | 3,626.65 mi (5,836.53 km) |
| Rhondda to Mastic (New York) | 3,272.12 mi (5,265.96 km) |
| Rhondda to Mastic Beach (New York) | 3,273.49 mi (5,268.17 km) |
| Rhondda to Matteson (Illinois) | 3,839.28 mi (6,178.73 km) |
| Rhondda to Matthews (North Carolina) | 3,852.61 mi (6,200.18 km) |
| Rhondda to Mattoon (Illinois) | 3,957.39 mi (6,368.80 km) |
