| Gifhorn to Olympia Heights (Florida) | 4,862.63 mi (7,825.65 km) |
| Gifhorn to Omaha (Nebraska) | 4,622.13 mi (7,438.60 km) |
| Gifhorn to On Top of the World Designated Place (Florida) | 4,762.42 mi (7,664.37 km) |
| Gifhorn to Onalaska (Wisconsin) | 4,323.83 mi (6,958.53 km) |
| Gifhorn to Oneida (New York) | 3,811.74 mi (6,134.40 km) |
| Gifhorn to Oneonta (New York) | 3,818.32 mi (6,144.99 km) |
| Gifhorn to Ontario (California) | 5,693.08 mi (9,162.12 km) |
| Gifhorn to Ontario (Oregon) | 5,075.88 mi (8,168.85 km) |
| Gifhorn to Opa-locka (Florida) | 4,850.01 mi (7,805.33 km) |
| Gifhorn to Opelika (Alabama) | 4,695.89 mi (7,557.30 km) |
| Gifhorn to Opelousas (Louisiana) | 5,060.97 mi (8,144.84 km) |
| Gifhorn to Orange (California) | 5,713.29 mi (9,194.65 km) |
| Gifhorn to Orange (Texas) | 5,144.61 mi (8,279.44 km) |
| Gifhorn to Orange City (Florida) | 4,731.97 mi (7,615.37 km) |
| Gifhorn to Orangeburg (South Carolina) | 4,479.76 mi (7,209.48 km) |
