| London Colney to Jeffersonville (Indiana) | 4,026.10 mi (6,479.38 km) |
| London Colney to Jenison (Michigan) | 3,818.10 mi (6,144.63 km) |
| London Colney to Jenks (Oklahoma) | 4,537.84 mi (7,302.94 km) |
| London Colney to Jennings (Missouri) | 4,184.80 mi (6,734.79 km) |
| London Colney to Jensen Beach (Florida) | 4,345.92 mi (6,994.08 km) |
| London Colney to Jericho (New York) | 3,427.29 mi (5,515.69 km) |
| London Colney to Jerome (Idaho) | 4,820.14 mi (7,757.27 km) |
| London Colney to Jersey City (New Jersey) | 3,451.74 mi (5,555.05 km) |
| London Colney to Jessup (Maryland) | 3,631.39 mi (5,844.16 km) |
| London Colney to Johns Creek (Georgia) | 4,173.42 mi (6,716.48 km) |
| London Colney to Johnson City (New York) | 3,467.36 mi (5,580.17 km) |
| London Colney to Johnson City (Tennessee) | 3,988.53 mi (6,418.92 km) |
| London Colney to Johnston (Iowa) | 4,170.55 mi (6,711.85 km) |
| London Colney to Johnstown (Colorado) | 4,637.08 mi (7,462.65 km) |
| London Colney to Johnstown (Pennsylvania) | 3,664.88 mi (5,898.06 km) |
