| Portsmouth to San Luis Obispo (California) | 5,450.49 mi (8,771.72 km) |
| Portsmouth to San Marcos (California) | 5,457.89 mi (8,783.63 km) |
| Portsmouth to San Marcos (Texas) | 4,926.08 mi (7,927.77 km) |
| Portsmouth to San Marino (California) | 5,433.26 mi (8,743.99 km) |
| Portsmouth to San Mateo (California) | 5,370.16 mi (8,642.44 km) |
| Portsmouth to San Pablo (California) | 5,347.45 mi (8,605.88 km) |
| Portsmouth to San Rafael (California) | 5,351.26 mi (8,612.03 km) |
| Portsmouth to San Ramon (California) | 5,346.68 mi (8,604.66 km) |
| Portsmouth to San Tan Valley (Arizona) | 5,262.59 mi (8,469.33 km) |
| Portsmouth to Sand Springs (Oklahoma) | 4,536.58 mi (7,300.92 km) |
| Portsmouth to Sandusky (Ohio) | 3,758.93 mi (6,049.41 km) |
| Portsmouth to Sandy (Oregon) | 4,920.29 mi (7,918.44 km) |
| Portsmouth to Sandy (Utah) | 4,870.77 mi (7,838.74 km) |
| Portsmouth to Sandy Springs (Georgia) | 4,173.01 mi (6,715.80 km) |
| Portsmouth to Sanford (Florida) | 4,292.12 mi (6,907.49 km) |
