| Glassboro to Orbetello | 4,292.77 mi (6,908.55 km) |
| Glassboro to Oria | 4,645.95 mi (7,476.94 km) |
| Glassboro to Oristano | 4,261.05 mi (6,857.50 km) |
| Glassboro to Orta Nova | 4,530.53 mi (7,291.18 km) |
| Glassboro to Orte | 4,343.87 mi (6,990.79 km) |
| Glassboro to Ortona | 4,436.04 mi (7,139.12 km) |
| Glassboro to Orvieto | 4,322.79 mi (6,956.86 km) |
| Glassboro to Orzinuovi | 4,138.75 mi (6,660.67 km) |
| Glassboro to Osimo | 4,356.09 mi (7,010.44 km) |
| Glassboro to Ospitaletto | 4,139.78 mi (6,662.34 km) |
| Glassboro to Ostuni | 4,634.87 mi (7,459.10 km) |
| Glassboro to Ottaviano | 4,493.79 mi (7,232.05 km) |
| Glassboro to Ovada | 4,107.26 mi (6,610.00 km) |
| Glassboro to Ozieri | 4,256.74 mi (6,850.57 km) |
| Glassboro to Paceco | 4,511.76 mi (7,260.97 km) |
