| Riverdale to Orbetello | 4,958.84 mi (7,980.49 km) |
| Riverdale to Oria | 5,312.47 mi (8,549.60 km) |
| Riverdale to Oristano | 4,923.88 mi (7,924.22 km) |
| Riverdale to Orta Nova | 5,197.01 mi (8,363.78 km) |
| Riverdale to Orte | 5,010.20 mi (8,063.14 km) |
| Riverdale to Ortona | 5,102.67 mi (8,211.96 km) |
| Riverdale to Orvieto | 4,989.18 mi (8,029.31 km) |
| Riverdale to Orzinuovi | 4,805.64 mi (7,733.93 km) |
| Riverdale to Osimo | 5,022.90 mi (8,083.57 km) |
| Riverdale to Ospitaletto | 4,806.69 mi (7,735.62 km) |
| Riverdale to Ostuni | 5,301.46 mi (8,531.87 km) |
| Riverdale to Ottaviano | 5,159.77 mi (8,303.85 km) |
| Riverdale to Ovada | 4,773.87 mi (7,682.81 km) |
| Riverdale to Ozieri | 4,920.55 mi (7,918.86 km) |
| Riverdale to Paceco | 5,174.44 mi (8,327.46 km) |
