| Rhondda to Rockville (Maryland) | 3,524.57 mi (5,672.25 km) |
| Rhondda to Rockville Centre (New York) | 3,310.93 mi (5,328.42 km) |
| Rhondda to Rockwall (Texas) | 4,595.74 mi (7,396.13 km) |
| Rhondda to Rocky Mount (North Carolina) | 3,692.40 mi (5,942.34 km) |
| Rhondda to Rocky Point (New York) | 3,270.44 mi (5,263.26 km) |
| Rhondda to Rocky River (Ohio) | 3,609.33 mi (5,808.66 km) |
| Rhondda to Roessleville (New York) | 3,232.20 mi (5,201.73 km) |
| Rhondda to Rogers (Arkansas) | 4,335.83 mi (6,977.85 km) |
| Rhondda to Rogers (Minnesota) | 3,889.93 mi (6,260.23 km) |
| Rhondda to Rohnert Park (California) | 5,225.54 mi (8,409.70 km) |
| Rhondda to Rolla (Missouri) | 4,163.08 mi (6,699.84 km) |
| Rhondda to Rolling Meadows (Illinois) | 3,824.23 mi (6,154.50 km) |
| Rhondda to Roma (Texas) | 5,034.66 mi (8,102.50 km) |
| Rhondda to Rome (Georgia) | 4,077.54 mi (6,562.16 km) |
| Rhondda to Rome (New York) | 3,279.12 mi (5,277.23 km) |
