| Harpenden to Alum Rock (California) | 5,337.83 mi (8,590.40 km) |
| Harpenden to Alvin (Texas) | 4,847.88 mi (7,801.91 km) |
| Harpenden to Amarillo (Texas) | 4,792.06 mi (7,712.07 km) |
| Harpenden to Amelia (Ohio) | 3,930.72 mi (6,325.89 km) |
| Harpenden to American Canyon (California) | 5,303.51 mi (8,535.18 km) |
| Harpenden to American Fork (Utah) | 4,857.35 mi (7,817.16 km) |
| Harpenden to Americus (Georgia) | 4,266.55 mi (6,866.35 km) |
| Harpenden to Ames (Iowa) | 4,145.41 mi (6,671.40 km) |
| Harpenden to Amherst (Ohio) | 3,742.92 mi (6,023.65 km) |
| Harpenden to Ammon (Idaho) | 4,693.87 mi (7,554.05 km) |
| Harpenden to Amsterdam (New York) | 3,357.15 mi (5,402.81 km) |
| Harpenden to Anacortes (Washington) | 4,718.79 mi (7,594.15 km) |
| Harpenden to Anaheim (California) | 5,418.88 mi (8,720.84 km) |
| Harpenden to Anchorage (Alaska) | 4,443.49 mi (7,151.11 km) |
| Harpenden to Anderson (California) | 5,172.68 mi (8,324.63 km) |
