| Rhondda to Orangevale (California) | 5,161.12 mi (8,306.03 km) |
| Rhondda to Orchards (Washington) | 4,803.43 mi (7,730.37 km) |
| Rhondda to Orcutt (California) | 5,353.20 mi (8,615.15 km) |
| Rhondda to Oregon (Ohio) | 3,663.94 mi (5,896.54 km) |
| Rhondda to Oregon (Wisconsin) | 3,837.65 mi (6,176.10 km) |
| Rhondda to Oregon City (Oregon) | 4,824.73 mi (7,764.65 km) |
| Rhondda to Orem (Utah) | 4,767.22 mi (7,672.10 km) |
| Rhondda to Orinda (California) | 5,236.51 mi (8,427.35 km) |
| Rhondda to Orland Park (Illinois) | 3,839.25 mi (6,178.68 km) |
| Rhondda to Orlando (Florida) | 4,200.31 mi (6,759.74 km) |
| Rhondda to Ormond Beach (Florida) | 4,149.72 mi (6,678.33 km) |
| Rhondda to Oro Valley (Arizona) | 5,168.44 mi (8,317.80 km) |
| Rhondda to Oroville (California) | 5,125.46 mi (8,248.64 km) |
| Rhondda to Oshkosh (Wisconsin) | 3,756.67 mi (6,045.77 km) |
| Rhondda to Oskaloosa (Iowa) | 4,036.84 mi (6,496.67 km) |
