| Ostend to Oswego (Illinois) | 4,108.00 mi (6,611.19 km) |
| Ostend to Oswego (New York) | 3,572.76 mi (5,749.81 km) |
| Ostend to Otsego (Minnesota) | 4,128.99 mi (6,644.96 km) |
| Ostend to Ottawa (Illinois) | 4,141.94 mi (6,665.82 km) |
| Ostend to Ottawa (Kansas) | 4,516.78 mi (7,269.06 km) |
| Ostend to Ottumwa (Iowa) | 4,291.63 mi (6,906.72 km) |
| Ostend to Overland (Missouri) | 4,328.90 mi (6,966.69 km) |
| Ostend to Overland Park (Kansas) | 4,481.05 mi (7,211.55 km) |
| Ostend to Overlea (Maryland) | 3,753.28 mi (6,040.32 km) |
| Ostend to Oviedo (Florida) | 4,457.38 mi (7,173.45 km) |
| Ostend to Owasso (Oklahoma) | 4,655.51 mi (7,492.32 km) |
| Ostend to Owatonna (Minnesota) | 4,171.74 mi (6,713.77 km) |
| Ostend to Owensboro (Kentucky) | 4,249.68 mi (6,839.19 km) |
| Ostend to Owings Mills (Maryland) | 3,762.23 mi (6,054.72 km) |
| Ostend to Owosso (Michigan) | 3,889.85 mi (6,260.11 km) |
