| Ilsenburg to Oestrich-Winkel | 174.01 mi (280.04 km) |
| Ilsenburg to Offenburg | 264.53 mi (425.72 km) |
| Ilsenburg to Oftersheim | 195.45 mi (314.54 km) |
| Ilsenburg to Ohrdruf | 71.79 mi (115.54 km) |
| Ilsenburg to Ohringen | 191.43 mi (308.08 km) |
| Ilsenburg to Olbernhau | 141.40 mi (227.57 km) |
| Ilsenburg to Olching | 254.90 mi (410.22 km) |
| Ilsenburg to Oldenburg | 136.27 mi (219.30 km) |
| Ilsenburg to Oldenburg in Holstein | 168.33 mi (270.90 km) |
| Ilsenburg to Olfen | 141.40 mi (227.55 km) |
| Ilsenburg to Olpe | 136.05 mi (218.96 km) |
| Ilsenburg to Olsberg | 100.92 mi (162.42 km) |
| Ilsenburg to Oranienburg | 124.08 mi (199.68 km) |
| Ilsenburg to Ortenberg | 126.03 mi (202.82 km) |
| Ilsenburg to Oschatz | 111.17 mi (178.92 km) |
