| Mountain Ash to Smyrna (Delaware) | 3,451.90 mi (5,555.30 km) |
| Mountain Ash to Smyrna (Georgia) | 4,069.77 mi (6,549.66 km) |
| Mountain Ash to Smyrna (Tennessee) | 4,050.34 mi (6,518.40 km) |
| Mountain Ash to Snellville (Georgia) | 4,049.04 mi (6,516.29 km) |
| Mountain Ash to Snoqualmie (Washington) | 4,678.71 mi (7,529.66 km) |
| Mountain Ash to Snyder (Texas) | 4,779.06 mi (7,691.15 km) |
| Mountain Ash to Socastee (South Carolina) | 3,849.98 mi (6,195.94 km) |
| Mountain Ash to Socorro (Texas) | 5,037.59 mi (8,107.21 km) |
| Mountain Ash to Soddy-Daisy (Tennessee) | 4,029.62 mi (6,485.05 km) |
| Mountain Ash to Solana Beach (California) | 5,353.53 mi (8,615.67 km) |
| Mountain Ash to Soledad (California) | 5,290.81 mi (8,514.74 km) |
| Mountain Ash to Solon (Ohio) | 3,596.45 mi (5,787.92 km) |
| Mountain Ash to Somers Point (New Jersey) | 3,409.51 mi (5,487.08 km) |
| Mountain Ash to Somerset (Kentucky) | 3,920.15 mi (6,308.87 km) |
| Mountain Ash to Somerset (New Jersey) | 3,353.46 mi (5,396.88 km) |
