| Hilliard to Oakley (California) | 2,057.54 mi (3,311.30 km) |
| Hilliard to Oakton (Virginia) | 322.21 mi (518.55 km) |
| Hilliard to Oakville (Missouri) | 398.51 mi (641.34 km) |
| Hilliard to Oatfield (Oregon) | 2,015.01 mi (3,242.84 km) |
| Hilliard to Ocala (Florida) | 752.33 mi (1,210.76 km) |
| Hilliard to Ocean Acres (New Jersey) | 470.86 mi (757.78 km) |
| Hilliard to Ocean City (New Jersey) | 458.04 mi (737.15 km) |
| Hilliard to Ocean Pines (Maryland) | 443.50 mi (713.74 km) |
| Hilliard to Ocean Pointe (Hawaii) | 4,502.60 mi (7,246.23 km) |
| Hilliard to Ocean Springs (Mississippi) | 736.72 mi (1,185.63 km) |
| Hilliard to Oceanside (California) | 1,938.37 mi (3,119.50 km) |
| Hilliard to Oceanside (New York) | 502.93 mi (809.38 km) |
| Hilliard to Ocoee (Florida) | 796.88 mi (1,282.46 km) |
| Hilliard to Oconomowoc (Wisconsin) | 347.64 mi (559.48 km) |
| Hilliard to Odenton (Maryland) | 350.74 mi (564.46 km) |
