| Krefeld to Oestrich-Winkel | 111.47 mi (179.39 km) |
| Krefeld to Offenburg | 207.18 mi (333.43 km) |
| Krefeld to Oftersheim | 162.17 mi (260.99 km) |
| Krefeld to Ohrdruf | 184.15 mi (296.35 km) |
| Krefeld to Ohringen | 196.21 mi (315.76 km) |
| Krefeld to Olbernhau | 297.70 mi (479.10 km) |
| Krefeld to Olching | 302.87 mi (487.42 km) |
| Krefeld to Oldenburg | 143.19 mi (230.45 km) |
| Krefeld to Oldenburg in Holstein | 272.86 mi (439.12 km) |
| Krefeld to Olfen | 43.98 mi (70.77 km) |
| Krefeld to Olpe | 59.07 mi (95.06 km) |
| Krefeld to Olsberg | 82.73 mi (133.14 km) |
| Krefeld to Oranienburg | 299.85 mi (482.56 km) |
| Krefeld to Ortenberg | 127.85 mi (205.76 km) |
| Krefeld to Oschatz | 282.36 mi (454.42 km) |
