| Ann Arbor to Oerlinghausen | 4,096.13 mi (6,592.08 km) |
| Ann Arbor to Oestrich-Winkel | 4,141.24 mi (6,664.69 km) |
| Ann Arbor to Offenburg | 4,194.27 mi (6,750.02 km) |
| Ann Arbor to Oftersheim | 4,186.30 mi (6,737.19 km) |
| Ann Arbor to Ohrdruf | 4,213.20 mi (6,780.48 km) |
| Ann Arbor to Ohringen | 4,227.48 mi (6,803.47 km) |
| Ann Arbor to Olbernhau | 4,314.36 mi (6,943.29 km) |
| Ann Arbor to Olching | 4,334.64 mi (6,975.93 km) |
| Ann Arbor to Oldenburg | 4,038.72 mi (6,499.69 km) |
| Ann Arbor to Oldenburg in Holstein | 4,092.57 mi (6,586.36 km) |
| Ann Arbor to Olfen | 4,057.59 mi (6,530.07 km) |
| Ann Arbor to Olpe | 4,098.79 mi (6,596.37 km) |
| Ann Arbor to Olsberg | 4,111.19 mi (6,616.32 km) |
| Ann Arbor to Oranienburg | 4,231.12 mi (6,809.33 km) |
| Ann Arbor to Ortenberg | 4,168.21 mi (6,708.08 km) |
