| Fallbrook to Orangevale (California) | 429.86 mi (691.80 km) |
| Fallbrook to Orchards (Washington) | 896.39 mi (1,442.60 km) |
| Fallbrook to Orcutt (California) | 210.14 mi (338.18 km) |
| Fallbrook to Oregon (Ohio) | 1,924.55 mi (3,097.26 km) |
| Fallbrook to Oregon (Wisconsin) | 1,640.50 mi (2,640.12 km) |
| Fallbrook to Oregon City (Oregon) | 874.96 mi (1,408.12 km) |
| Fallbrook to Orem (Utah) | 567.68 mi (913.59 km) |
| Fallbrook to Orinda (California) | 417.65 mi (672.14 km) |
| Fallbrook to Orland Park (Illinois) | 1,697.63 mi (2,732.07 km) |
| Fallbrook to Orlando (Florida) | 2,143.23 mi (3,449.20 km) |
| Fallbrook to Ormond Beach (Florida) | 2,139.72 mi (3,443.54 km) |
| Fallbrook to Oro Valley (Arizona) | 368.36 mi (592.82 km) |
| Fallbrook to Oroville (California) | 487.24 mi (784.14 km) |
| Fallbrook to Oshkosh (Wisconsin) | 1,700.34 mi (2,736.43 km) |
| Fallbrook to Oskaloosa (Iowa) | 1,451.10 mi (2,335.33 km) |
