| Glen Parva to Orbetello | 905.72 mi (1,457.61 km) |
| Glen Parva to Oria | 1,215.96 mi (1,956.89 km) |
| Glen Parva to Oristano | 990.34 mi (1,593.80 km) |
| Glen Parva to Orta Nova | 1,107.46 mi (1,782.28 km) |
| Glen Parva to Orte | 939.85 mi (1,512.54 km) |
| Glen Parva to Ortona | 1,010.13 mi (1,625.65 km) |
| Glen Parva to Orvieto | 917.17 mi (1,476.04 km) |
| Glen Parva to Orzinuovi | 705.32 mi (1,135.10 km) |
| Glen Parva to Osimo | 920.60 mi (1,481.57 km) |
| Glen Parva to Ospitaletto | 701.82 mi (1,129.47 km) |
| Glen Parva to Ostuni | 1,202.00 mi (1,934.44 km) |
| Glen Parva to Ottaviano | 1,093.70 mi (1,760.14 km) |
| Glen Parva to Ovada | 707.41 mi (1,138.47 km) |
| Glen Parva to Ozieri | 957.39 mi (1,540.77 km) |
| Glen Parva to Paceco | 1,204.78 mi (1,938.91 km) |
