| Petersburg to Oerlinghausen | 4,099.74 mi (6,597.90 km) |
| Petersburg to Oestrich-Winkel | 4,125.76 mi (6,639.78 km) |
| Petersburg to Offenburg | 4,165.33 mi (6,703.46 km) |
| Petersburg to Oftersheim | 4,167.08 mi (6,706.27 km) |
| Petersburg to Ohrdruf | 4,212.77 mi (6,779.80 km) |
| Petersburg to Ohringen | 4,209.54 mi (6,774.60 km) |
| Petersburg to Olbernhau | 4,320.32 mi (6,952.89 km) |
| Petersburg to Olching | 4,313.96 mi (6,942.64 km) |
| Petersburg to Oldenburg | 4,051.59 mi (6,520.40 km) |
| Petersburg to Oldenburg in Holstein | 4,122.58 mi (6,634.65 km) |
| Petersburg to Olfen | 4,055.53 mi (6,526.74 km) |
| Petersburg to Olpe | 4,091.75 mi (6,585.04 km) |
| Petersburg to Olsberg | 4,108.88 mi (6,612.61 km) |
| Petersburg to Oranienburg | 4,254.22 mi (6,846.50 km) |
| Petersburg to Ortenberg | 4,158.86 mi (6,693.04 km) |
