| Rhondda to Somersworth (New Hampshire) | 3,090.59 mi (4,973.82 km) |
| Rhondda to Somerton (Arizona) | 5,289.61 mi (8,512.81 km) |
| Rhondda to Somerville (Massachusetts) | 3,134.32 mi (5,044.19 km) |
| Rhondda to Somerville (New Jersey) | 3,354.98 mi (5,399.32 km) |
| Rhondda to Sonoma (California) | 5,221.66 mi (8,403.45 km) |
| Rhondda to Soquel (California) | 5,279.90 mi (8,497.17 km) |
| Rhondda to South Bend (Indiana) | 3,774.24 mi (6,074.05 km) |
| Rhondda to South Bradenton (Florida) | 4,303.57 mi (6,925.93 km) |
| Rhondda to South Burlington (Vermont) | 3,137.38 mi (5,049.13 km) |
| Rhondda to South Charleston (West Virginia) | 3,744.38 mi (6,025.99 km) |
| Rhondda to South Daytona (Florida) | 4,152.23 mi (6,682.37 km) |
| Rhondda to South El Monte (California) | 5,322.13 mi (8,565.14 km) |
| Rhondda to South Elgin (Illinois) | 3,839.17 mi (6,178.55 km) |
| Rhondda to South Euclid (Ohio) | 3,593.89 mi (5,783.80 km) |
| Rhondda to South Farmingdale (New York) | 3,300.78 mi (5,312.09 km) |
