| Portsmouth to Stephenville (Texas) | 4,816.55 mi (7,751.49 km) |
| Portsmouth to Sterling (Colorado) | 4,572.12 mi (7,358.12 km) |
| Portsmouth to Sterling (Illinois) | 4,016.34 mi (6,463.67 km) |
| Portsmouth to Sterling (Virginia) | 3,651.39 mi (5,876.35 km) |
| Portsmouth to Sterling Heights (Michigan) | 3,722.10 mi (5,990.14 km) |
| Portsmouth to Steubenville (Ohio) | 3,724.34 mi (5,993.75 km) |
| Portsmouth to Stevens Point (Wisconsin) | 3,886.72 mi (6,255.07 km) |
| Portsmouth to Stevenson Ranch (California) | 5,433.69 mi (8,744.67 km) |
| Portsmouth to Stillwater (Minnesota) | 3,983.77 mi (6,411.25 km) |
| Portsmouth to Stillwater (Oklahoma) | 4,573.13 mi (7,359.73 km) |
| Portsmouth to Stockbridge (Georgia) | 4,186.86 mi (6,738.10 km) |
| Portsmouth to Stockton (California) | 5,315.36 mi (8,554.25 km) |
| Portsmouth to Stone Ridge (Virginia) | 3,660.97 mi (5,891.76 km) |
| Portsmouth to Stonecrest (Georgia) | 4,175.42 mi (6,719.70 km) |
| Portsmouth to Stony Brook (New York) | 3,392.37 mi (5,459.49 km) |
