| Altena to Oestrich-Winkel | 91.00 mi (146.45 km) |
| Altena to Offenburg | 196.12 mi (315.63 km) |
| Altena to Oftersheim | 139.32 mi (224.21 km) |
| Altena to Ohrdruf | 137.06 mi (220.57 km) |
| Altena to Ohringen | 166.16 mi (267.41 km) |
| Altena to Olbernhau | 250.27 mi (402.77 km) |
| Altena to Olching | 269.05 mi (433.00 km) |
| Altena to Oldenburg | 129.49 mi (208.39 km) |
| Altena to Oldenburg in Holstein | 246.96 mi (397.45 km) |
| Altena to Olfen | 31.26 mi (50.32 km) |
| Altena to Olpe | 20.86 mi (33.58 km) |
| Altena to Olsberg | 35.43 mi (57.01 km) |
| Altena to Oranienburg | 257.15 mi (413.85 km) |
| Altena to Ortenberg | 89.04 mi (143.30 km) |
| Altena to Oschatz | 234.98 mi (378.16 km) |
