| Portsmouth to Hutchinson (Minnesota) | 4,047.87 mi (6,514.42 km) |
| Portsmouth to Hutto (Texas) | 4,876.14 mi (7,847.39 km) |
| Portsmouth to Hyattsville (Maryland) | 3,634.68 mi (5,849.46 km) |
| Portsmouth to Hybla Valley (Virginia) | 3,649.34 mi (5,873.04 km) |
| Portsmouth to Idaho Falls (Idaho) | 4,720.45 mi (7,596.83 km) |
| Portsmouth to Idylwood (Virginia) | 3,648.23 mi (5,871.26 km) |
| Portsmouth to Ilchester (Maryland) | 3,615.66 mi (5,818.85 km) |
| Portsmouth to Immokalee (Florida) | 4,415.30 mi (7,105.74 km) |
| Portsmouth to Imperial (California) | 5,420.41 mi (8,723.31 km) |
| Portsmouth to Imperial Beach (California) | 5,487.90 mi (8,831.93 km) |
| Portsmouth to Independence (Kentucky) | 3,945.24 mi (6,349.25 km) |
| Portsmouth to Independence (Missouri) | 4,322.90 mi (6,957.03 km) |
| Portsmouth to Indian Trail (North Carolina) | 3,964.68 mi (6,380.54 km) |
| Portsmouth to Indiana (Pennsylvania) | 3,652.33 mi (5,877.86 km) |
| Portsmouth to Indianapolis (Indiana) | 3,971.05 mi (6,390.78 km) |
