| Garden Grove to Olympia Heights (Florida) | 2,310.73 mi (3,718.77 km) |
| Garden Grove to Omaha (Nebraska) | 1,302.45 mi (2,096.10 km) |
| Garden Grove to On Top of the World Designated Place (Florida) | 2,116.90 mi (3,406.83 km) |
| Garden Grove to Onalaska (Wisconsin) | 1,590.69 mi (2,559.97 km) |
| Garden Grove to Oneida (New York) | 2,350.87 mi (3,783.37 km) |
| Garden Grove to Oneonta (New York) | 2,380.52 mi (3,831.08 km) |
| Garden Grove to Ontario (California) | 27.12 mi (43.65 km) |
| Garden Grove to Ontario (Oregon) | 709.97 mi (1,142.59 km) |
| Garden Grove to Opa-locka (Florida) | 2,310.82 mi (3,718.90 km) |
| Garden Grove to Opelika (Alabama) | 1,877.10 mi (3,020.90 km) |
| Garden Grove to Opelousas (Louisiana) | 1,526.32 mi (2,456.38 km) |
| Garden Grove to Orange (California) | 8.13 mi (13.08 km) |
| Garden Grove to Orange (Texas) | 1,437.57 mi (2,313.54 km) |
| Garden Grove to Orange City (Florida) | 2,177.91 mi (3,505.01 km) |
| Garden Grove to Orangeburg (South Carolina) | 2,122.12 mi (3,415.23 km) |
