| Risca to Smyrna (Delaware) | 3,465.17 mi (5,576.66 km) |
| Risca to Smyrna (Georgia) | 4,083.06 mi (6,571.06 km) |
| Risca to Smyrna (Tennessee) | 4,063.69 mi (6,539.88 km) |
| Risca to Snellville (Georgia) | 4,062.32 mi (6,537.67 km) |
| Risca to Snoqualmie (Washington) | 4,690.52 mi (7,548.66 km) |
| Risca to Snyder (Texas) | 4,792.37 mi (7,712.58 km) |
| Risca to Socastee (South Carolina) | 3,863.15 mi (6,217.14 km) |
| Risca to Socorro (Texas) | 5,050.83 mi (8,128.52 km) |
| Risca to Soddy-Daisy (Tennessee) | 4,042.95 mi (6,506.50 km) |
| Risca to Solana Beach (California) | 5,366.36 mi (8,636.33 km) |
| Risca to Soledad (California) | 5,303.29 mi (8,534.83 km) |
| Risca to Solon (Ohio) | 3,609.80 mi (5,809.41 km) |
| Risca to Somers Point (New Jersey) | 3,422.77 mi (5,508.41 km) |
| Risca to Somerset (Kentucky) | 3,933.49 mi (6,330.34 km) |
| Risca to Somerset (New Jersey) | 3,366.75 mi (5,418.26 km) |
