| Colonia to Oerlinghausen | 3,818.96 mi (6,146.02 km) |
| Colonia to Oestrich-Winkel | 3,847.56 mi (6,192.05 km) |
| Colonia to Offenburg | 3,889.26 mi (6,259.16 km) |
| Colonia to Oftersheim | 3,889.48 mi (6,259.52 km) |
| Colonia to Ohrdruf | 3,932.62 mi (6,328.93 km) |
| Colonia to Ohringen | 3,931.80 mi (6,327.63 km) |
| Colonia to Olbernhau | 4,039.49 mi (6,500.92 km) |
| Colonia to Olching | 4,036.77 mi (6,496.55 km) |
| Colonia to Oldenburg | 3,769.69 mi (6,066.72 km) |
| Colonia to Oldenburg in Holstein | 3,839.04 mi (6,178.35 km) |
| Colonia to Olfen | 3,775.40 mi (6,075.93 km) |
| Colonia to Olpe | 3,812.33 mi (6,135.35 km) |
| Colonia to Olsberg | 3,828.85 mi (6,161.94 km) |
| Colonia to Oranienburg | 3,971.44 mi (6,391.42 km) |
| Colonia to Ortenberg | 3,879.83 mi (6,243.98 km) |
