| Cal to Oakley (California) | 6,867.95 mi (11,052.89 km) |
| Cal to Oakton (Virginia) | 5,376.05 mi (8,651.91 km) |
| Cal to Oakville (Missouri) | 5,909.56 mi (9,510.51 km) |
| Cal to Oatfield (Oregon) | 6,410.72 mi (10,317.05 km) |
| Cal to Ocala (Florida) | 6,027.19 mi (9,699.83 km) |
| Cal to Ocean Acres (New Jersey) | 5,213.09 mi (8,389.65 km) |
| Cal to Ocean City (New Jersey) | 5,246.78 mi (8,443.87 km) |
| Cal to Ocean Pines (Maryland) | 5,307.68 mi (8,541.88 km) |
| Cal to Ocean Pointe (Hawaii) | 8,304.54 mi (13,364.87 km) |
| Cal to Ocean Springs (Mississippi) | 6,251.75 mi (10,061.22 km) |
| Cal to Oceanside (California) | 7,065.73 mi (11,371.20 km) |
| Cal to Oceanside (New York) | 5,148.67 mi (8,285.98 km) |
| Cal to Ocoee (Florida) | 6,027.79 mi (9,700.80 km) |
| Cal to Oconomowoc (Wisconsin) | 5,612.03 mi (9,031.69 km) |
| Cal to Odenton (Maryland) | 5,343.03 mi (8,598.78 km) |
