| Portsmouth to Superior (Colorado) | 4,676.72 mi (7,526.45 km) |
| Portsmouth to Superior (Wisconsin) | 3,882.32 mi (6,247.99 km) |
| Portsmouth to Surprise (Arizona) | 5,266.15 mi (8,475.05 km) |
| Portsmouth to Susanville (California) | 5,154.95 mi (8,296.09 km) |
| Portsmouth to Sussex (Wisconsin) | 3,899.05 mi (6,274.91 km) |
| Portsmouth to Suwanee (Georgia) | 4,155.06 mi (6,686.93 km) |
| Portsmouth to Swansea (Illinois) | 4,179.84 mi (6,726.80 km) |
| Portsmouth to Sweetwater (Florida) | 4,402.39 mi (7,084.97 km) |
| Portsmouth to Sweetwater (Texas) | 4,888.32 mi (7,867.00 km) |
| Portsmouth to Sycamore (Illinois) | 3,968.41 mi (6,386.54 km) |
| Portsmouth to Sylacauga (Alabama) | 4,287.59 mi (6,900.21 km) |
| Portsmouth to Sylvania (Ohio) | 3,787.24 mi (6,094.97 km) |
| Portsmouth to Syosset (New York) | 3,411.70 mi (5,490.60 km) |
| Portsmouth to Syracuse (New York) | 3,427.35 mi (5,515.78 km) |
| Portsmouth to Syracuse (Utah) | 4,850.23 mi (7,805.69 km) |
