| Zachary to Oerlinghausen | 4,965.51 mi (7,991.21 km) |
| Zachary to Oestrich-Winkel | 5,001.24 mi (8,048.72 km) |
| Zachary to Offenburg | 5,046.99 mi (8,122.34 km) |
| Zachary to Oftersheim | 5,044.41 mi (8,118.19 km) |
| Zachary to Ohrdruf | 5,080.96 mi (8,177.02 km) |
| Zachary to Ohringen | 5,086.38 mi (8,185.74 km) |
| Zachary to Olbernhau | 5,185.36 mi (8,345.03 km) |
| Zachary to Olching | 5,192.31 mi (8,356.22 km) |
| Zachary to Oldenburg | 4,912.12 mi (7,905.30 km) |
| Zachary to Oldenburg in Holstein | 4,973.09 mi (8,003.42 km) |
| Zachary to Olfen | 4,924.18 mi (7,924.70 km) |
| Zachary to Olpe | 4,963.03 mi (7,987.23 km) |
| Zachary to Olsberg | 4,977.79 mi (8,010.98 km) |
| Zachary to Oranienburg | 5,109.27 mi (8,222.58 km) |
| Zachary to Ortenberg | 5,031.45 mi (8,097.34 km) |
