| Rancho San Diego to Orangeburg (South Carolina) | 2,076.12 mi (3,341.20 km) |
| Rancho San Diego to Orangevale (California) | 475.07 mi (764.56 km) |
| Rancho San Diego to Orchards (Washington) | 941.65 mi (1,515.45 km) |
| Rancho San Diego to Orcutt (California) | 248.19 mi (399.42 km) |
| Rancho San Diego to Oregon (Ohio) | 1,928.36 mi (3,103.40 km) |
| Rancho San Diego to Oregon (Wisconsin) | 1,648.10 mi (2,652.35 km) |
| Rancho San Diego to Oregon City (Oregon) | 920.29 mi (1,481.06 km) |
| Rancho San Diego to Orem (Utah) | 595.61 mi (958.54 km) |
| Rancho San Diego to Orinda (California) | 461.31 mi (742.40 km) |
| Rancho San Diego to Orland Park (Illinois) | 1,702.27 mi (2,739.54 km) |
| Rancho San Diego to Orlando (Florida) | 2,126.35 mi (3,422.02 km) |
| Rancho San Diego to Ormond Beach (Florida) | 2,124.06 mi (3,418.34 km) |
| Rancho San Diego to Oro Valley (Arizona) | 346.72 mi (557.99 km) |
| Rancho San Diego to Oroville (California) | 532.58 mi (857.11 km) |
| Rancho San Diego to Oshkosh (Wisconsin) | 1,709.63 mi (2,751.39 km) |
