| Fallbrook to Odessa (Texas) | 871.29 mi (1,402.20 km) |
| Fallbrook to Ogden (Utah) | 614.78 mi (989.39 km) |
| Fallbrook to Oildale (California) | 175.62 mi (282.63 km) |
| Fallbrook to Ojus (Florida) | 2,270.97 mi (3,654.77 km) |
| Fallbrook to Okemos (Michigan) | 1,884.36 mi (3,032.58 km) |
| Fallbrook to Oklahoma City (Oklahoma) | 1,130.94 mi (1,820.08 km) |
| Fallbrook to Okmulgee (Oklahoma) | 1,215.88 mi (1,956.77 km) |
| Fallbrook to Olathe (Kansas) | 1,303.30 mi (2,097.46 km) |
| Fallbrook to Old Jamestown (Missouri) | 1,544.54 mi (2,485.70 km) |
| Fallbrook to Oldsmar (Florida) | 2,075.70 mi (3,340.51 km) |
| Fallbrook to Olean (New York) | 2,183.33 mi (3,513.73 km) |
| Fallbrook to Olive Branch (Mississippi) | 1,564.22 mi (2,517.37 km) |
| Fallbrook to Olivehurst (California) | 462.37 mi (744.12 km) |
| Fallbrook to Olney (Maryland) | 2,253.79 mi (3,627.13 km) |
| Fallbrook to Olympia (Washington) | 990.23 mi (1,593.62 km) |
