| Portsmouth to Somersworth (New Hampshire) | 3,203.86 mi (5,156.11 km) |
| Portsmouth to Somerton (Arizona) | 5,403.82 mi (8,696.61 km) |
| Portsmouth to Somerville (Massachusetts) | 3,247.25 mi (5,225.95 km) |
| Portsmouth to Somerville (New Jersey) | 3,467.99 mi (5,581.19 km) |
| Portsmouth to Sonoma (California) | 5,332.14 mi (8,581.25 km) |
| Portsmouth to Soquel (California) | 5,390.98 mi (8,675.94 km) |
| Portsmouth to South Bend (Indiana) | 3,889.38 mi (6,259.35 km) |
| Portsmouth to South Bradenton (Florida) | 4,413.36 mi (7,102.62 km) |
| Portsmouth to South Burlington (Vermont) | 3,251.56 mi (5,232.89 km) |
| Portsmouth to South Charleston (West Virginia) | 3,858.21 mi (6,209.19 km) |
| Portsmouth to South Daytona (Florida) | 4,262.15 mi (6,859.27 km) |
| Portsmouth to South El Monte (California) | 5,435.26 mi (8,747.21 km) |
| Portsmouth to South Elgin (Illinois) | 3,954.45 mi (6,364.07 km) |
| Portsmouth to South Euclid (Ohio) | 3,708.52 mi (5,968.28 km) |
| Portsmouth to South Farmingdale (New York) | 3,413.56 mi (5,493.59 km) |
