| Oer-Erkenschwick to Oestrich-Winkel | 118.08 mi (190.03 km) |
| Oer-Erkenschwick to Offenburg | 221.48 mi (356.44 km) |
| Oer-Erkenschwick to Oftersheim | 167.53 mi (269.62 km) |
| Oer-Erkenschwick to Ohrdruf | 160.77 mi (258.74 km) |
| Oer-Erkenschwick to Ohringen | 195.62 mi (314.82 km) |
| Oer-Erkenschwick to Olbernhau | 271.99 mi (437.72 km) |
| Oer-Erkenschwick to Olching | 298.70 mi (480.71 km) |
| Oer-Erkenschwick to Oldenburg | 111.42 mi (179.31 km) |
| Oer-Erkenschwick to Oldenburg in Holstein | 237.77 mi (382.66 km) |
| Oer-Erkenschwick to Olfen | 7.66 mi (12.33 km) |
| Oer-Erkenschwick to Olpe | 50.00 mi (80.47 km) |
| Oer-Erkenschwick to Olsberg | 56.73 mi (91.30 km) |
| Oer-Erkenschwick to Oranienburg | 264.81 mi (426.17 km) |
| Oer-Erkenschwick to Ortenberg | 118.55 mi (190.79 km) |
| Oer-Erkenschwick to Oschatz | 253.09 mi (407.31 km) |
