| Portsmouth to Portage (Michigan) | 3,839.36 mi (6,178.85 km) |
| Portsmouth to Portage (Wisconsin) | 3,927.54 mi (6,320.77 km) |
| Portsmouth to Portales (New Mexico) | 4,911.18 mi (7,903.79 km) |
| Portsmouth to Porterville (California) | 5,353.12 mi (8,615.02 km) |
| Portsmouth to Portland (Maine) | 3,161.86 mi (5,088.53 km) |
| Portsmouth to Portland (Oregon) | 4,922.94 mi (7,922.70 km) |
| Portsmouth to Portland (Tennessee) | 4,134.79 mi (6,654.31 km) |
| Portsmouth to Portland (Texas) | 5,004.45 mi (8,053.88 km) |
| Portsmouth to Portsmouth (New Hampshire) | 3,207.36 mi (5,161.75 km) |
| Portsmouth to Portsmouth (Ohio) | 3,889.50 mi (6,259.55 km) |
| Portsmouth to Portsmouth (Virginia) | 3,703.65 mi (5,960.46 km) |
| Portsmouth to Post Falls (Idaho) | 4,640.82 mi (7,468.68 km) |
| Portsmouth to Potomac (Maryland) | 3,642.28 mi (5,861.68 km) |
| Portsmouth to Potomac Park (California) | 5,390.65 mi (8,675.41 km) |
| Portsmouth to Pottstown (Pennsylvania) | 3,524.43 mi (5,672.02 km) |
