| Manassas Park to Orbetello | 4,432.09 mi (7,132.76 km) |
| Manassas Park to Oria | 4,784.96 mi (7,700.64 km) |
| Manassas Park to Oristano | 4,401.16 mi (7,082.98 km) |
| Manassas Park to Orta Nova | 4,669.57 mi (7,514.94 km) |
| Manassas Park to Orte | 4,483.03 mi (7,214.74 km) |
| Manassas Park to Ortona | 4,574.95 mi (7,362.67 km) |
| Manassas Park to Orvieto | 4,461.90 mi (7,180.74 km) |
| Manassas Park to Orzinuovi | 4,277.21 mi (6,883.51 km) |
| Manassas Park to Osimo | 4,494.74 mi (7,233.59 km) |
| Manassas Park to Ospitaletto | 4,278.16 mi (6,885.03 km) |
| Manassas Park to Ostuni | 4,773.81 mi (7,682.70 km) |
| Manassas Park to Ottaviano | 4,633.14 mi (7,456.31 km) |
| Manassas Park to Ovada | 4,246.19 mi (6,833.59 km) |
| Manassas Park to Ozieri | 4,396.71 mi (7,075.83 km) |
| Manassas Park to Paceco | 4,651.87 mi (7,486.47 km) |
