| Pittsburg to Octeville | 5,372.25 mi (8,645.80 km) |
| Pittsburg to Oignies | 5,468.82 mi (8,801.22 km) |
| Pittsburg to Oissel | 5,470.63 mi (8,804.13 km) |
| Pittsburg to Olivet | 5,571.32 mi (8,966.17 km) |
| Pittsburg to Ollioules | 5,944.01 mi (9,565.95 km) |
| Pittsburg to Olonne-sur-Mer | 5,521.82 mi (8,886.50 km) |
| Pittsburg to Oloron-Sainte-Marie | 5,729.12 mi (9,220.13 km) |
| Pittsburg to Onet Village | 5,775.10 mi (9,294.13 km) |
| Pittsburg to Onnaing | 5,490.50 mi (8,836.11 km) |
| Pittsburg to Orange | 5,857.73 mi (9,427.11 km) |
| Pittsburg to Orchies | 5,475.77 mi (8,812.41 km) |
| Pittsburg to Orleans | 5,569.58 mi (8,963.37 km) |
| Pittsburg to Orly | 5,540.72 mi (8,916.93 km) |
| Pittsburg to Ormesson-sur-Marne | 5,542.92 mi (8,920.47 km) |
| Pittsburg to Orsay | 5,536.91 mi (8,910.79 km) |
