| Hilliard to Odessa (Texas) | 1,208.41 mi (1,944.74 km) |
| Hilliard to Ogden (Utah) | 1,506.02 mi (2,423.71 km) |
| Hilliard to Oildale (California) | 1,972.34 mi (3,174.17 km) |
| Hilliard to Ojus (Florida) | 987.97 mi (1,589.99 km) |
| Hilliard to Okemos (Michigan) | 195.65 mi (314.87 km) |
| Hilliard to Oklahoma City (Oklahoma) | 844.12 mi (1,358.49 km) |
| Hilliard to Okmulgee (Oklahoma) | 763.96 mi (1,229.48 km) |
| Hilliard to Olathe (Kansas) | 626.73 mi (1,008.63 km) |
| Hilliard to Old Jamestown (Missouri) | 389.06 mi (626.13 km) |
| Hilliard to Oldsmar (Florida) | 828.53 mi (1,333.39 km) |
| Hilliard to Olean (New York) | 283.86 mi (456.83 km) |
| Hilliard to Olive Branch (Mississippi) | 507.02 mi (815.97 km) |
| Hilliard to Olivehurst (California) | 2,030.60 mi (3,267.93 km) |
| Hilliard to Olney (Maryland) | 329.76 mi (530.69 km) |
| Hilliard to Olympia (Washington) | 2,025.06 mi (3,259.02 km) |
