| Hanover to Oerlinghausen | 3,959.22 mi (6,371.75 km) |
| Hanover to Oestrich-Winkel | 3,989.98 mi (6,421.25 km) |
| Hanover to Offenburg | 4,033.07 mi (6,490.59 km) |
| Hanover to Oftersheim | 4,032.32 mi (6,489.39 km) |
| Hanover to Ohrdruf | 4,073.43 mi (6,555.55 km) |
| Hanover to Ohringen | 4,074.53 mi (6,557.33 km) |
| Hanover to Olbernhau | 4,179.63 mi (6,726.47 km) |
| Hanover to Olching | 4,179.84 mi (6,726.80 km) |
| Hanover to Oldenburg | 3,908.78 mi (6,290.58 km) |
| Hanover to Oldenburg in Holstein | 3,975.98 mi (6,398.73 km) |
| Hanover to Olfen | 3,916.29 mi (6,302.66 km) |
| Hanover to Olpe | 3,953.80 mi (6,363.03 km) |
| Hanover to Olsberg | 3,969.80 mi (6,388.78 km) |
| Hanover to Oranienburg | 4,109.41 mi (6,613.46 km) |
| Hanover to Ortenberg | 4,021.61 mi (6,472.15 km) |
