| Rhondda to Mountain Brook (Alabama) | 4,178.82 mi (6,725.16 km) |
| Rhondda to Mountain Home (Arkansas) | 4,265.85 mi (6,865.21 km) |
| Rhondda to Mountain Home (Idaho) | 4,743.01 mi (7,633.14 km) |
| Rhondda to Mountain House (California) | 5,223.49 mi (8,406.40 km) |
| Rhondda to Mountain Park (Georgia) | 4,054.48 mi (6,525.06 km) |
| Rhondda to Mountain Top (Pennsylvania) | 3,383.85 mi (5,445.78 km) |
| Rhondda to Mountain View (California) | 5,260.94 mi (8,466.67 km) |
| Rhondda to Mountlake Terrace (Washington) | 4,679.24 mi (7,530.50 km) |
| Rhondda to Mukilteo (Washington) | 4,672.55 mi (7,519.75 km) |
| Rhondda to Muncie (Indiana) | 3,807.11 mi (6,126.96 km) |
| Rhondda to Mundelein (Illinois) | 3,814.79 mi (6,139.30 km) |
| Rhondda to Munhall (Pennsylvania) | 3,578.54 mi (5,759.11 km) |
| Rhondda to Munster (Indiana) | 3,828.16 mi (6,160.83 km) |
| Rhondda to Murfreesboro (Tennessee) | 4,051.43 mi (6,520.15 km) |
| Rhondda to Murphy (Texas) | 4,597.34 mi (7,398.71 km) |
