| Petersburg to Oberkirch | 4,169.74 mi (6,710.55 km) |
| Petersburg to Obernburg am Main | 4,176.73 mi (6,721.79 km) |
| Petersburg to Obernkirchen | 4,109.46 mi (6,613.54 km) |
| Petersburg to Oberschleissheim | 4,322.76 mi (6,956.82 km) |
| Petersburg to Oberstdorf | 4,294.56 mi (6,911.43 km) |
| Petersburg to Obertraubling | 4,325.52 mi (6,961.25 km) |
| Petersburg to Obertshausen | 4,157.88 mi (6,691.45 km) |
| Petersburg to Oberursel | 4,143.70 mi (6,668.63 km) |
| Petersburg to Ochsenfurt | 4,219.78 mi (6,791.08 km) |
| Petersburg to Ochsenhausen | 4,260.92 mi (6,857.29 km) |
| Petersburg to Ochtrup | 4,035.44 mi (6,494.41 km) |
| Petersburg to Odenthal | 4,062.50 mi (6,537.96 km) |
| Petersburg to Oelde | 4,082.89 mi (6,570.77 km) |
| Petersburg to Oelsnitz | 4,281.75 mi (6,890.81 km) |
| Petersburg to Oer-Erkenschwick | 4,052.17 mi (6,521.34 km) |
