| Fort Carson to Oerlinghausen | 5,006.63 mi (8,057.40 km) |
| Fort Carson to Oestrich-Winkel | 5,074.63 mi (8,166.83 km) |
| Fort Carson to Offenburg | 5,142.58 mi (8,276.19 km) |
| Fort Carson to Oftersheim | 5,123.06 mi (8,244.76 km) |
| Fort Carson to Ohrdruf | 5,125.45 mi (8,248.62 km) |
| Fort Carson to Ohringen | 5,161.54 mi (8,306.70 km) |
| Fort Carson to Olbernhau | 5,215.21 mi (8,393.06 km) |
| Fort Carson to Olching | 5,269.23 mi (8,480.00 km) |
| Fort Carson to Oldenburg | 4,938.88 mi (7,948.36 km) |
| Fort Carson to Oldenburg in Holstein | 4,967.68 mi (7,994.71 km) |
| Fort Carson to Olfen | 4,976.57 mi (8,009.02 km) |
| Fort Carson to Olpe | 5,022.86 mi (8,083.52 km) |
| Fort Carson to Olsberg | 5,028.88 mi (8,093.20 km) |
| Fort Carson to Oranienburg | 5,111.25 mi (8,225.76 km) |
| Fort Carson to Ortenberg | 5,093.18 mi (8,196.69 km) |
