| Pittsburg to Oerlinghausen | 5,544.20 mi (8,922.53 km) |
| Pittsburg to Oestrich-Winkel | 5,634.30 mi (9,067.53 km) |
| Pittsburg to Offenburg | 5,716.37 mi (9,199.62 km) |
| Pittsburg to Oftersheim | 5,684.72 mi (9,148.67 km) |
| Pittsburg to Ohrdruf | 5,660.46 mi (9,109.63 km) |
| Pittsburg to Ohringen | 5,718.91 mi (9,203.69 km) |
| Pittsburg to Olbernhau | 5,734.66 mi (9,229.05 km) |
| Pittsburg to Olching | 5,823.45 mi (9,371.93 km) |
| Pittsburg to Oldenburg | 5,468.16 mi (8,800.16 km) |
| Pittsburg to Oldenburg in Holstein | 5,469.95 mi (8,803.04 km) |
| Pittsburg to Olfen | 5,524.24 mi (8,890.41 km) |
| Pittsburg to Olpe | 5,574.29 mi (8,970.95 km) |
| Pittsburg to Olsberg | 5,573.26 mi (8,969.30 km) |
| Pittsburg to Oranienburg | 5,612.90 mi (9,033.10 km) |
| Pittsburg to Ortenberg | 5,643.06 mi (9,081.62 km) |
