| Harpenden to Black Forest (Colorado) | 4,689.92 mi (7,547.69 km) |
| Harpenden to Blackfoot (Idaho) | 4,721.18 mi (7,598.00 km) |
| Harpenden to Blackhawk (California) | 5,314.34 mi (8,552.61 km) |
| Harpenden to Blacksburg (Virginia) | 3,863.46 mi (6,217.63 km) |
| Harpenden to Blackwells Mills (New Jersey) | 3,479.69 mi (5,600.01 km) |
| Harpenden to Blaine (Minnesota) | 3,980.13 mi (6,405.40 km) |
| Harpenden to Bloomingdale (Florida) | 4,395.15 mi (7,073.32 km) |
| Harpenden to Bloomingdale (Illinois) | 3,943.19 mi (6,345.94 km) |
| Harpenden to Bloomington (California) | 5,391.56 mi (8,676.88 km) |
| Harpenden to Bloomington (Illinois) | 4,046.20 mi (6,511.73 km) |
| Harpenden to Bloomington (Indiana) | 4,014.47 mi (6,460.67 km) |
| Harpenden to Bloomington (Minnesota) | 3,999.97 mi (6,437.32 km) |
| Harpenden to Bloomsburg (Pennsylvania) | 3,531.69 mi (5,683.71 km) |
| Harpenden to Blue Ash (Ohio) | 3,926.68 mi (6,319.38 km) |
| Harpenden to Blue Island (Illinois) | 3,941.36 mi (6,343.01 km) |
