| Rhondda to Marshall (Minnesota) | 4,004.37 mi (6,444.40 km) |
| Rhondda to Marshall (Missouri) | 4,162.30 mi (6,698.58 km) |
| Rhondda to Marshall (Texas) | 4,532.69 mi (7,294.67 km) |
| Rhondda to Marshalltown (Iowa) | 4,011.85 mi (6,456.45 km) |
| Rhondda to Marshfield (Wisconsin) | 3,788.40 mi (6,096.84 km) |
| Rhondda to Martha Lake (Washington) | 4,674.07 mi (7,522.19 km) |
| Rhondda to Martin (Tennessee) | 4,125.90 mi (6,640.00 km) |
| Rhondda to Martinez (California) | 5,227.86 mi (8,413.42 km) |
| Rhondda to Martinez (Georgia) | 3,986.06 mi (6,414.95 km) |
| Rhondda to Martinsburg (West Virginia) | 3,541.70 mi (5,699.82 km) |
| Rhondda to Martinsville (Indiana) | 3,884.23 mi (6,251.07 km) |
| Rhondda to Martinsville (New Jersey) | 3,352.15 mi (5,394.76 km) |
| Rhondda to Martinsville (Virginia) | 3,744.80 mi (6,026.68 km) |
| Rhondda to Maryland City (Maryland) | 3,509.35 mi (5,647.76 km) |
| Rhondda to Maryland Heights (Missouri) | 4,075.86 mi (6,559.46 km) |
