| Pittsburg to Oberkirch | 5,716.91 mi (9,200.48 km) |
| Pittsburg to Obernburg am Main | 5,673.84 mi (9,131.17 km) |
| Pittsburg to Obernkirchen | 5,539.30 mi (8,914.64 km) |
| Pittsburg to Oberschleissheim | 5,827.25 mi (9,378.05 km) |
| Pittsburg to Oberstdorf | 5,839.85 mi (9,398.33 km) |
| Pittsburg to Obertraubling | 5,802.36 mi (9,338.00 km) |
| Pittsburg to Obertshausen | 5,653.09 mi (9,097.77 km) |
| Pittsburg to Oberursel | 5,638.71 mi (9,074.62 km) |
| Pittsburg to Ochsenfurt | 5,708.98 mi (9,187.72 km) |
| Pittsburg to Ochsenhausen | 5,793.78 mi (9,324.19 km) |
| Pittsburg to Ochtrup | 5,492.65 mi (8,839.57 km) |
| Pittsburg to Odenthal | 5,554.16 mi (8,938.55 km) |
| Pittsburg to Oelde | 5,538.08 mi (8,912.67 km) |
| Pittsburg to Oelsnitz | 5,719.98 mi (9,205.42 km) |
| Pittsburg to Oer-Erkenschwick | 5,524.76 mi (8,891.24 km) |
