| Portsmouth to Troy (Michigan) | 3,726.60 mi (5,997.39 km) |
| Portsmouth to Troy (Missouri) | 4,198.36 mi (6,756.60 km) |
| Portsmouth to Troy (New York) | 3,339.33 mi (5,374.14 km) |
| Portsmouth to Troy (Ohio) | 3,882.18 mi (6,247.77 km) |
| Portsmouth to Truckee (California) | 5,203.00 mi (8,373.41 km) |
| Portsmouth to Trujillo Alto (Puerto Rico) | 4,153.22 mi (6,683.97 km) |
| Portsmouth to Trumbull Center (Connecticut) | 3,380.67 mi (5,440.67 km) |
| Portsmouth to Trussville (Alabama) | 4,278.41 mi (6,885.43 km) |
| Portsmouth to Tualatin (Oregon) | 4,935.47 mi (7,942.86 km) |
| Portsmouth to Tuckahoe (Virginia) | 3,721.90 mi (5,989.82 km) |
| Portsmouth to Tucker (Georgia) | 4,170.50 mi (6,711.77 km) |
| Portsmouth to Tucson (Arizona) | 5,294.37 mi (8,520.46 km) |
| Portsmouth to Tucson Estates (Arizona) | 5,301.85 mi (8,532.50 km) |
| Portsmouth to Tucson Mountains (Arizona) | 5,294.45 mi (8,520.59 km) |
| Portsmouth to Tukwila (Washington) | 4,802.91 mi (7,729.54 km) |
