| Boulder to Isny im Allgau | 5,196.03 mi (8,362.20 km) |
| Boulder to Isselburg | 4,884.89 mi (7,861.47 km) |
| Boulder to Issum | 4,896.87 mi (7,880.74 km) |
| Boulder to Itzehoe | 4,883.35 mi (7,858.99 km) |
| Boulder to Jena | 5,089.28 mi (8,190.40 km) |
| Boulder to Jever | 4,850.55 mi (7,806.21 km) |
| Boulder to Jork | 4,906.60 mi (7,896.41 km) |
| Boulder to Juchen | 4,919.33 mi (7,916.90 km) |
| Boulder to Julich | 4,922.80 mi (7,922.48 km) |
| Boulder to Juterbog | 5,082.50 mi (8,179.49 km) |
| Boulder to Kaarst | 4,917.80 mi (7,914.44 km) |
| Boulder to Kaiserslautern | 5,037.41 mi (8,106.93 km) |
| Boulder to Kalkar | 4,883.55 mi (7,859.31 km) |
| Boulder to Kall | 4,946.09 mi (7,959.96 km) |
| Boulder to Kaltenkirchen | 4,900.63 mi (7,886.80 km) |
