| Mountain Ash to Southern Pines (North Carolina) | 3,795.46 mi (6,108.20 km) |
| Mountain Ash to Southfield (Michigan) | 3,620.43 mi (5,826.51 km) |
| Mountain Ash to Southgate (Michigan) | 3,630.26 mi (5,842.34 km) |
| Mountain Ash to Southlake (Texas) | 4,621.34 mi (7,437.33 km) |
| Mountain Ash to Spanaway (Washington) | 4,718.85 mi (7,594.25 km) |
| Mountain Ash to Spanish Fork (Utah) | 4,773.76 mi (7,682.63 km) |
| Mountain Ash to Spanish Lake (Missouri) | 4,061.74 mi (6,536.73 km) |
| Mountain Ash to Spanish Springs (Nevada) | 5,056.61 mi (8,137.83 km) |
| Mountain Ash to Sparks (Nevada) | 5,062.73 mi (8,147.68 km) |
| Mountain Ash to Spartanburg (South Carolina) | 3,911.46 mi (6,294.88 km) |
| Mountain Ash to Spearfish (South Dakota) | 4,282.73 mi (6,892.39 km) |
| Mountain Ash to Speedway (Indiana) | 3,859.21 mi (6,210.79 km) |
| Mountain Ash to Spencer (Iowa) | 4,041.76 mi (6,504.58 km) |
| Mountain Ash to Spokane (Washington) | 4,546.87 mi (7,317.48 km) |
| Mountain Ash to Spokane Valley (Washington) | 4,541.38 mi (7,308.64 km) |
