| Rancho San Diego to Oskaloosa (Iowa) | 1,456.76 mi (2,344.42 km) |
| Rancho San Diego to Oswego (Illinois) | 1,679.34 mi (2,702.63 km) |
| Rancho San Diego to Oswego (New York) | 2,292.62 mi (3,689.62 km) |
| Rancho San Diego to Otsego (Minnesota) | 1,511.23 mi (2,432.09 km) |
| Rancho San Diego to Ottawa (Illinois) | 1,649.86 mi (2,655.20 km) |
| Rancho San Diego to Ottawa (Kansas) | 1,276.94 mi (2,055.04 km) |
| Rancho San Diego to Ottumwa (Iowa) | 1,462.82 mi (2,354.19 km) |
| Rancho San Diego to Overland (Missouri) | 1,538.53 mi (2,476.02 km) |
| Rancho San Diego to Overland Park (Kansas) | 1,311.43 mi (2,110.55 km) |
| Rancho San Diego to Overlea (Maryland) | 2,282.63 mi (3,673.54 km) |
| Rancho San Diego to Oviedo (Florida) | 2,131.43 mi (3,430.20 km) |
| Rancho San Diego to Owasso (Oklahoma) | 1,222.32 mi (1,967.13 km) |
| Rancho San Diego to Owatonna (Minnesota) | 1,494.02 mi (2,404.40 km) |
| Rancho San Diego to Owensboro (Kentucky) | 1,708.83 mi (2,750.10 km) |
| Rancho San Diego to Owings Mills (Maryland) | 2,267.95 mi (3,649.91 km) |
