| Iserlohn to Oestrich-Winkel | 96.68 mi (155.60 km) |
| Iserlohn to Offenburg | 201.87 mi (324.87 km) |
| Iserlohn to Oftersheim | 144.82 mi (233.07 km) |
| Iserlohn to Ohrdruf | 138.42 mi (222.77 km) |
| Iserlohn to Ohringen | 171.17 mi (275.48 km) |
| Iserlohn to Olbernhau | 251.12 mi (404.14 km) |
| Iserlohn to Olching | 273.57 mi (440.27 km) |
| Iserlohn to Oldenburg | 123.83 mi (199.28 km) |
| Iserlohn to Oldenburg in Holstein | 242.09 mi (389.60 km) |
| Iserlohn to Olfen | 26.06 mi (41.93 km) |
| Iserlohn to Olpe | 26.34 mi (42.38 km) |
| Iserlohn to Olsberg | 35.30 mi (56.81 km) |
| Iserlohn to Oranienburg | 254.76 mi (409.99 km) |
| Iserlohn to Ortenberg | 93.30 mi (150.16 km) |
| Iserlohn to Oschatz | 234.83 mi (377.93 km) |
