| Hermiston to Odessa (Texas) | 1,321.21 mi (2,126.28 km) |
| Hermiston to Ogden (Utah) | 485.00 mi (780.53 km) |
| Hermiston to Oildale (California) | 718.92 mi (1,156.99 km) |
| Hermiston to Ojus (Florida) | 2,547.75 mi (4,100.21 km) |
| Hermiston to Okemos (Michigan) | 1,724.87 mi (2,775.91 km) |
| Hermiston to Oklahoma City (Oklahoma) | 1,340.64 mi (2,157.56 km) |
| Hermiston to Okmulgee (Oklahoma) | 1,401.04 mi (2,254.76 km) |
| Hermiston to Olathe (Kansas) | 1,331.66 mi (2,143.10 km) |
| Hermiston to Old Jamestown (Missouri) | 1,548.04 mi (2,491.33 km) |
| Hermiston to Oldsmar (Florida) | 2,336.13 mi (3,759.63 km) |
| Hermiston to Olean (New York) | 2,025.97 mi (3,260.48 km) |
| Hermiston to Olive Branch (Mississippi) | 1,708.35 mi (2,749.32 km) |
| Hermiston to Olivehurst (California) | 480.69 mi (773.59 km) |
| Hermiston to Olney (Maryland) | 2,173.31 mi (3,497.61 km) |
| Hermiston to Olympia (Washington) | 191.11 mi (307.57 km) |
