| Rhondda to Mitchell (South Dakota) | 4,119.31 mi (6,629.40 km) |
| Rhondda to Mitchellville (Maryland) | 3,517.09 mi (5,660.21 km) |
| Rhondda to Moberly (Missouri) | 4,118.36 mi (6,627.86 km) |
| Rhondda to Mobile (Alabama) | 4,373.77 mi (7,038.91 km) |
| Rhondda to Modesto (California) | 5,214.08 mi (8,391.25 km) |
| Rhondda to Mokena (Illinois) | 3,843.31 mi (6,185.20 km) |
| Rhondda to Moline (Illinois) | 3,946.22 mi (6,350.83 km) |
| Rhondda to Moncks Corner (South Carolina) | 3,915.74 mi (6,301.77 km) |
| Rhondda to Monfort Heights (Ohio) | 3,822.42 mi (6,151.60 km) |
| Rhondda to Monmouth (Oregon) | 4,870.33 mi (7,838.04 km) |
| Rhondda to Monroe (Georgia) | 4,039.63 mi (6,501.15 km) |
| Rhondda to Monroe (Louisiana) | 4,442.83 mi (7,150.05 km) |
| Rhondda to Monroe (Michigan) | 3,650.40 mi (5,874.74 km) |
| Rhondda to Monroe (North Carolina) | 3,851.70 mi (6,198.71 km) |
| Rhondda to Monroe (Ohio) | 3,800.69 mi (6,116.62 km) |
