| Harpenden to Accokeek (Maryland) | 3,657.90 mi (5,886.82 km) |
| Harpenden to Acworth (Georgia) | 4,187.12 mi (6,738.51 km) |
| Harpenden to Ada (Oklahoma) | 4,622.23 mi (7,438.76 km) |
| Harpenden to Addison (Illinois) | 3,940.98 mi (6,342.40 km) |
| Harpenden to Addison (Texas) | 4,721.93 mi (7,599.22 km) |
| Harpenden to Adelanto (California) | 5,363.03 mi (8,630.97 km) |
| Harpenden to Adelphi (Maryland) | 3,641.55 mi (5,860.51 km) |
| Harpenden to Adrian (Michigan) | 3,790.86 mi (6,100.81 km) |
| Harpenden to Affton (Missouri) | 4,190.80 mi (6,744.44 km) |
| Harpenden to Agoura Hills (California) | 5,429.82 mi (8,738.45 km) |
| Harpenden to Aguadilla (Puerto Rico) | 4,238.14 mi (6,820.63 km) |
| Harpenden to Aiken (South Carolina) | 4,092.94 mi (6,586.95 km) |
| Harpenden to Akron (Ohio) | 3,729.74 mi (6,002.44 km) |
| Harpenden to Alabaster (Alabama) | 4,315.08 mi (6,944.45 km) |
| Harpenden to Alachua (Florida) | 4,308.99 mi (6,934.65 km) |
