| Bolu to Oerlinghausen | 1,332.05 mi (2,143.73 km) |
| Bolu to Oestrich-Winkel | 1,304.57 mi (2,099.50 km) |
| Bolu to Offenburg | 1,274.45 mi (2,051.03 km) |
| Bolu to Oftersheim | 1,265.21 mi (2,036.16 km) |
| Bolu to Ohrdruf | 1,217.13 mi (1,958.79 km) |
| Bolu to Ohringen | 1,222.40 mi (1,967.27 km) |
| Bolu to Olbernhau | 1,112.23 mi (1,789.96 km) |
| Bolu to Olching | 1,120.89 mi (1,803.90 km) |
| Bolu to Oldenburg | 1,386.66 mi (2,231.62 km) |
| Bolu to Oldenburg in Holstein | 1,337.19 mi (2,152.00 km) |
| Bolu to Olfen | 1,374.24 mi (2,211.62 km) |
| Bolu to Olpe | 1,337.22 mi (2,152.05 km) |
| Bolu to Olsberg | 1,320.72 mi (2,125.50 km) |
| Bolu to Oranienburg | 1,196.07 mi (1,924.88 km) |
| Bolu to Ortenberg | 1,270.20 mi (2,044.18 km) |
