| Rancho San Diego to Odenton (Maryland) | 2,273.72 mi (3,659.20 km) |
| Rancho San Diego to Odessa (Texas) | 852.51 mi (1,371.98 km) |
| Rancho San Diego to Ogden (Utah) | 645.29 mi (1,038.49 km) |
| Rancho San Diego to Oildale (California) | 220.30 mi (354.55 km) |
| Rancho San Diego to Ojus (Florida) | 2,251.29 mi (3,623.09 km) |
| Rancho San Diego to Okemos (Michigan) | 1,890.13 mi (3,041.87 km) |
| Rancho San Diego to Oklahoma City (Oklahoma) | 1,123.82 mi (1,808.61 km) |
| Rancho San Diego to Okmulgee (Oklahoma) | 1,209.00 mi (1,945.70 km) |
| Rancho San Diego to Olathe (Kansas) | 1,304.38 mi (2,099.20 km) |
| Rancho San Diego to Old Jamestown (Missouri) | 1,544.30 mi (2,485.31 km) |
| Rancho San Diego to Oldsmar (Florida) | 2,057.70 mi (3,311.55 km) |
| Rancho San Diego to Olean (New York) | 2,187.28 mi (3,520.09 km) |
| Rancho San Diego to Olive Branch (Mississippi) | 1,555.93 mi (2,504.03 km) |
| Rancho San Diego to Olivehurst (California) | 507.57 mi (816.86 km) |
| Rancho San Diego to Olney (Maryland) | 2,253.34 mi (3,626.40 km) |
