| Portsmouth to La Riviera (California) | 5,282.84 mi (8,501.90 km) |
| Portsmouth to La Vergne (Tennessee) | 4,163.34 mi (6,700.24 km) |
| Portsmouth to La Verne (California) | 5,422.07 mi (8,725.98 km) |
| Portsmouth to La Vista (Nebraska) | 4,285.80 mi (6,897.33 km) |
| Portsmouth to Lacey (Washington) | 4,841.18 mi (7,791.13 km) |
| Portsmouth to Lackawanna (New York) | 3,544.98 mi (5,705.10 km) |
| Portsmouth to Laconia (New Hampshire) | 3,215.59 mi (5,174.98 km) |
| Portsmouth to Ladera Ranch (California) | 5,450.09 mi (8,771.08 km) |
| Portsmouth to Ladson (South Carolina) | 4,039.00 mi (6,500.14 km) |
| Portsmouth to Lady Lake (Florida) | 4,313.37 mi (6,941.70 km) |
| Portsmouth to Lafayette (California) | 5,344.77 mi (8,601.58 km) |
| Portsmouth to Lafayette (Colorado) | 4,671.51 mi (7,518.07 km) |
| Portsmouth to Lafayette (Indiana) | 3,970.66 mi (6,390.16 km) |
| Portsmouth to Lafayette (Louisiana) | 4,671.31 mi (7,517.74 km) |
| Portsmouth to LaGrange (Georgia) | 4,244.36 mi (6,830.63 km) |
