| Fort Collins to Isny im Allgau | 5,161.78 mi (8,307.08 km) |
| Fort Collins to Isselburg | 4,850.25 mi (7,805.72 km) |
| Fort Collins to Issum | 4,862.29 mi (7,825.10 km) |
| Fort Collins to Itzehoe | 4,848.02 mi (7,802.13 km) |
| Fort Collins to Jena | 5,054.26 mi (8,134.04 km) |
| Fort Collins to Jever | 4,815.44 mi (7,749.70 km) |
| Fort Collins to Jork | 4,871.32 mi (7,839.63 km) |
| Fort Collins to Juchen | 4,884.83 mi (7,861.38 km) |
| Fort Collins to Julich | 4,888.35 mi (7,867.05 km) |
| Fort Collins to Juterbog | 5,047.15 mi (8,122.60 km) |
| Fort Collins to Kaarst | 4,883.27 mi (7,858.86 km) |
| Fort Collins to Kaiserslautern | 5,003.10 mi (8,051.71 km) |
| Fort Collins to Kalkar | 4,848.95 mi (7,803.62 km) |
| Fort Collins to Kall | 4,911.70 mi (7,904.61 km) |
| Fort Collins to Kaltenkirchen | 4,865.27 mi (7,829.90 km) |
