| College Park to Orbetello | 4,400.72 mi (7,082.28 km) |
| College Park to Oria | 4,753.64 mi (7,650.25 km) |
| College Park to Oristano | 4,369.68 mi (7,032.32 km) |
| College Park to Orta Nova | 4,638.25 mi (7,464.54 km) |
| College Park to Orte | 4,451.69 mi (7,164.31 km) |
| College Park to Ortona | 4,543.66 mi (7,312.31 km) |
| College Park to Orvieto | 4,430.57 mi (7,130.32 km) |
| College Park to Orzinuovi | 4,245.99 mi (6,833.27 km) |
| College Park to Osimo | 4,463.49 mi (7,183.29 km) |
| College Park to Ospitaletto | 4,246.96 mi (6,834.82 km) |
| College Park to Ostuni | 4,742.51 mi (7,632.33 km) |
| College Park to Ottaviano | 4,601.77 mi (7,405.83 km) |
| College Park to Ovada | 4,214.89 mi (6,783.21 km) |
| College Park to Ozieri | 4,365.25 mi (7,025.19 km) |
| College Park to Paceco | 4,620.39 mi (7,435.80 km) |
