| Portsmouth to Smyrna (Delaware) | 3,564.28 mi (5,736.15 km) |
| Portsmouth to Smyrna (Georgia) | 4,182.57 mi (6,731.20 km) |
| Portsmouth to Smyrna (Tennessee) | 4,164.47 mi (6,702.07 km) |
| Portsmouth to Snellville (Georgia) | 4,161.67 mi (6,697.56 km) |
| Portsmouth to Snoqualmie (Washington) | 4,788.19 mi (7,705.85 km) |
| Portsmouth to Snyder (Texas) | 4,894.95 mi (7,877.66 km) |
| Portsmouth to Socastee (South Carolina) | 3,960.66 mi (6,374.07 km) |
| Portsmouth to Socorro (Texas) | 5,153.71 mi (8,294.09 km) |
| Portsmouth to Soddy-Daisy (Tennessee) | 4,143.16 mi (6,667.76 km) |
| Portsmouth to Solana Beach (California) | 5,468.61 mi (8,800.87 km) |
| Portsmouth to Soledad (California) | 5,404.17 mi (8,697.18 km) |
| Portsmouth to Solon (Ohio) | 3,711.16 mi (5,972.53 km) |
| Portsmouth to Somers Point (New Jersey) | 3,521.57 mi (5,667.42 km) |
| Portsmouth to Somerset (Kentucky) | 4,034.17 mi (6,492.36 km) |
| Portsmouth to Somerset (New Jersey) | 3,466.11 mi (5,578.17 km) |
