| Rhondda to Security-Widefield (Colorado) | 4,607.57 mi (7,415.17 km) |
| Rhondda to Sedalia (Missouri) | 4,183.34 mi (6,732.43 km) |
| Rhondda to Sedro-Woolley (Washington) | 4,637.03 mi (7,462.58 km) |
| Rhondda to Seguin (Texas) | 4,827.26 mi (7,768.73 km) |
| Rhondda to Selden (New York) | 3,277.71 mi (5,274.96 km) |
| Rhondda to Selma (Alabama) | 4,243.24 mi (6,828.83 km) |
| Rhondda to Selma (California) | 5,230.76 mi (8,418.09 km) |
| Rhondda to Selma (Texas) | 4,841.07 mi (7,790.95 km) |
| Rhondda to Seminole (Florida) | 4,292.96 mi (6,908.85 km) |
| Rhondda to Seven Hills (Ohio) | 3,606.17 mi (5,803.57 km) |
| Rhondda to Seven Oaks (South Carolina) | 3,921.28 mi (6,310.69 km) |
| Rhondda to Severn (Maryland) | 3,503.35 mi (5,638.09 km) |
| Rhondda to Severna Park (Maryland) | 3,500.26 mi (5,633.13 km) |
| Rhondda to Sevierville (Tennessee) | 3,934.01 mi (6,331.18 km) |
| Rhondda to Seymour (Indiana) | 3,884.46 mi (6,251.43 km) |
