| Fallbrook to Oswego (Illinois) | 1,674.42 mi (2,694.71 km) |
| Fallbrook to Oswego (New York) | 2,286.80 mi (3,680.25 km) |
| Fallbrook to Otsego (Minnesota) | 1,497.14 mi (2,409.42 km) |
| Fallbrook to Ottawa (Illinois) | 1,645.43 mi (2,648.06 km) |
| Fallbrook to Ottawa (Kansas) | 1,276.39 mi (2,054.14 km) |
| Fallbrook to Ottumwa (Iowa) | 1,457.84 mi (2,346.17 km) |
| Fallbrook to Overland (Missouri) | 1,539.05 mi (2,476.87 km) |
| Fallbrook to Overland Park (Kansas) | 1,310.39 mi (2,108.87 km) |
| Fallbrook to Overlea (Maryland) | 2,282.75 mi (3,673.73 km) |
| Fallbrook to Oviedo (Florida) | 2,148.01 mi (3,456.88 km) |
| Fallbrook to Owasso (Oklahoma) | 1,227.47 mi (1,975.42 km) |
| Fallbrook to Owatonna (Minnesota) | 1,482.38 mi (2,385.66 km) |
| Fallbrook to Owensboro (Kentucky) | 1,711.59 mi (2,754.53 km) |
| Fallbrook to Owings Mills (Maryland) | 2,268.00 mi (3,650.00 km) |
| Fallbrook to Owosso (Michigan) | 1,899.43 mi (3,056.84 km) |
