| Oulu to Oestrich-Winkel | 1,214.15 mi (1,953.98 km) |
| Oulu to Offenburg | 1,312.21 mi (2,111.80 km) |
| Oulu to Oftersheim | 1,243.16 mi (2,000.67 km) |
| Oulu to Ohrdruf | 1,113.17 mi (1,791.47 km) |
| Oulu to Ohringen | 1,238.04 mi (1,992.43 km) |
| Oulu to Olbernhau | 1,082.82 mi (1,742.63 km) |
| Oulu to Olching | 1,273.53 mi (2,049.55 km) |
| Oulu to Oldenburg | 1,016.58 mi (1,636.03 km) |
| Oulu to Oldenburg in Holstein | 893.81 mi (1,438.44 km) |
| Oulu to Olfen | 1,119.86 mi (1,802.23 km) |
| Oulu to Olpe | 1,153.98 mi (1,857.15 km) |
| Oulu to Olsberg | 1,120.85 mi (1,803.84 km) |
| Oulu to Oranienburg | 949.26 mi (1,527.69 km) |
| Oulu to Ortenberg | 1,172.41 mi (1,886.82 km) |
| Oulu to Oschatz | 1,044.93 mi (1,681.66 km) |
