| Bad Nenndorf to Oestrich-Winkel | 172.15 mi (277.05 km) |
| Bad Nenndorf to Offenburg | 274.86 mi (442.35 km) |
| Bad Nenndorf to Oftersheim | 207.85 mi (334.51 km) |
| Bad Nenndorf to Ohrdruf | 119.36 mi (192.09 km) |
| Bad Nenndorf to Ohringen | 216.80 mi (348.91 km) |
| Bad Nenndorf to Olbernhau | 205.50 mi (330.72 km) |
| Bad Nenndorf to Olching | 298.34 mi (480.14 km) |
| Bad Nenndorf to Oldenburg | 74.04 mi (119.16 km) |
| Bad Nenndorf to Oldenburg in Holstein | 149.17 mi (240.07 km) |
| Bad Nenndorf to Olfen | 95.03 mi (152.94 km) |
| Bad Nenndorf to Olpe | 112.71 mi (181.38 km) |
| Bad Nenndorf to Olsberg | 78.17 mi (125.80 km) |
| Bad Nenndorf to Oranienburg | 164.64 mi (264.97 km) |
| Bad Nenndorf to Ortenberg | 137.59 mi (221.43 km) |
| Bad Nenndorf to Oschatz | 174.59 mi (280.97 km) |
