| Ianca to Oerlinghausen | 977.13 mi (1,572.54 km) |
| Ianca to Oestrich-Winkel | 964.70 mi (1,552.53 km) |
| Ianca to Offenburg | 949.61 mi (1,528.24 km) |
| Ianca to Oftersheim | 930.06 mi (1,496.79 km) |
| Ianca to Ohrdruf | 865.79 mi (1,393.35 km) |
| Ianca to Ohringen | 887.30 mi (1,427.96 km) |
| Ianca to Olbernhau | 756.58 mi (1,217.59 km) |
| Ianca to Olching | 793.16 mi (1,276.47 km) |
| Ianca to Oldenburg | 1,026.61 mi (1,652.17 km) |
| Ianca to Oldenburg in Holstein | 970.59 mi (1,562.01 km) |
| Ianca to Olfen | 1,022.74 mi (1,645.95 km) |
| Ianca to Olpe | 989.67 mi (1,592.72 km) |
| Ianca to Olsberg | 969.85 mi (1,560.82 km) |
| Ianca to Oranienburg | 830.86 mi (1,337.14 km) |
| Ianca to Ortenberg | 925.55 mi (1,489.53 km) |
