| Harpenden to Allouez (Wisconsin) | 3,824.22 mi (6,154.50 km) |
| Harpenden to Aloha (Oregon) | 4,897.08 mi (7,881.09 km) |
| Harpenden to Alpena (Michigan) | 3,625.84 mi (5,835.23 km) |
| Harpenden to Alpharetta (Georgia) | 4,170.35 mi (6,711.53 km) |
| Harpenden to Alpine (California) | 5,440.09 mi (8,754.97 km) |
| Harpenden to Alpine (Utah) | 4,851.99 mi (7,808.53 km) |
| Harpenden to Alsip (Illinois) | 3,942.90 mi (6,345.49 km) |
| Harpenden to Altadena (California) | 5,407.49 mi (8,702.52 km) |
| Harpenden to Altamont (Oregon) | 5,055.40 mi (8,135.88 km) |
| Harpenden to Altamonte Springs (Florida) | 4,319.59 mi (6,951.71 km) |
| Harpenden to Alton (Illinois) | 4,166.91 mi (6,706.00 km) |
| Harpenden to Alton (Texas) | 5,130.32 mi (8,256.46 km) |
| Harpenden to Altoona (Iowa) | 4,158.46 mi (6,692.40 km) |
| Harpenden to Altoona (Pennsylvania) | 3,631.63 mi (5,844.55 km) |
| Harpenden to Altus (Oklahoma) | 4,727.15 mi (7,607.62 km) |
