| Oakland to Olympia Heights (Florida) | 2,573.38 mi (4,141.45 km) |
| Oakland to Omaha (Nebraska) | 1,409.32 mi (2,268.08 km) |
| Oakland to On Top of the World Designated Place (Florida) | 2,359.77 mi (3,797.68 km) |
| Oakland to Onalaska (Wisconsin) | 1,664.05 mi (2,678.03 km) |
| Oakland to Oneida (New York) | 2,443.66 mi (3,932.69 km) |
| Oakland to Oneonta (New York) | 2,479.67 mi (3,990.65 km) |
| Oakland to Ontario (California) | 365.58 mi (588.35 km) |
| Oakland to Ontario (Oregon) | 510.14 mi (820.98 km) |
| Oakland to Opa-locka (Florida) | 2,571.99 mi (4,139.21 km) |
| Oakland to Opelika (Alabama) | 2,095.48 mi (3,372.36 km) |
| Oakland to Opelousas (Louisiana) | 1,785.80 mi (2,873.97 km) |
| Oakland to Orange (California) | 369.40 mi (594.49 km) |
| Oakland to Orange (Texas) | 1,706.91 mi (2,747.00 km) |
| Oakland to Orange City (Florida) | 2,419.32 mi (3,893.51 km) |
| Oakland to Orangeburg (South Carolina) | 2,321.79 mi (3,736.56 km) |
