| Mountain Ash to Security-Widefield (Colorado) | 4,606.43 mi (7,413.34 km) |
| Mountain Ash to Sedalia (Missouri) | 4,182.80 mi (6,731.57 km) |
| Mountain Ash to Sedro-Woolley (Washington) | 4,634.55 mi (7,458.59 km) |
| Mountain Ash to Seguin (Texas) | 4,827.04 mi (7,768.37 km) |
| Mountain Ash to Selden (New York) | 3,278.06 mi (5,275.53 km) |
| Mountain Ash to Selma (Alabama) | 4,243.47 mi (6,829.20 km) |
| Mountain Ash to Selma (California) | 5,228.95 mi (8,415.18 km) |
| Mountain Ash to Selma (Texas) | 4,840.83 mi (7,790.56 km) |
| Mountain Ash to Seminole (Florida) | 4,293.75 mi (6,910.12 km) |
| Mountain Ash to Seven Hills (Ohio) | 3,606.03 mi (5,803.35 km) |
| Mountain Ash to Seven Oaks (South Carolina) | 3,921.73 mi (6,311.42 km) |
| Mountain Ash to Severn (Maryland) | 3,503.65 mi (5,638.59 km) |
| Mountain Ash to Severna Park (Maryland) | 3,500.58 mi (5,633.64 km) |
| Mountain Ash to Sevierville (Tennessee) | 3,934.20 mi (6,331.48 km) |
| Mountain Ash to Seymour (Indiana) | 3,884.29 mi (6,251.16 km) |
