| Parkersburg to Orbetello | 4,590.99 mi (7,388.49 km) |
| Parkersburg to Oria | 4,940.87 mi (7,951.56 km) |
| Parkersburg to Oristano | 4,569.33 mi (7,353.62 km) |
| Parkersburg to Orta Nova | 4,825.89 mi (7,766.51 km) |
| Parkersburg to Orte | 4,640.52 mi (7,468.20 km) |
| Parkersburg to Ortona | 4,730.33 mi (7,612.73 km) |
| Parkersburg to Orvieto | 4,619.06 mi (7,433.65 km) |
| Parkersburg to Orzinuovi | 4,429.66 mi (7,128.85 km) |
| Parkersburg to Osimo | 4,648.30 mi (7,480.72 km) |
| Parkersburg to Ospitaletto | 4,430.03 mi (7,129.44 km) |
| Parkersburg to Ostuni | 4,929.22 mi (7,932.81 km) |
| Parkersburg to Ottaviano | 4,792.15 mi (7,712.23 km) |
| Parkersburg to Ovada | 4,402.13 mi (7,084.55 km) |
| Parkersburg to Ozieri | 4,562.77 mi (7,343.07 km) |
| Parkersburg to Paceco | 4,820.00 mi (7,757.03 km) |
