| Hermiston to Orangevale (California) | 503.42 mi (810.17 km) |
| Hermiston to Orchards (Washington) | 156.73 mi (252.24 km) |
| Hermiston to Orcutt (California) | 759.84 mi (1,222.85 km) |
| Hermiston to Oregon (Ohio) | 1,797.33 mi (2,892.52 km) |
| Hermiston to Oregon (Wisconsin) | 1,481.14 mi (2,383.67 km) |
| Hermiston to Oregon City (Oregon) | 163.45 mi (263.04 km) |
| Hermiston to Orem (Utah) | 540.69 mi (870.16 km) |
| Hermiston to Orinda (California) | 569.13 mi (915.93 km) |
| Hermiston to Orland Park (Illinois) | 1,585.39 mi (2,551.44 km) |
| Hermiston to Orlando (Florida) | 2,377.75 mi (3,826.62 km) |
| Hermiston to Ormond Beach (Florida) | 2,352.02 mi (3,785.20 km) |
| Hermiston to Oro Valley (Arizona) | 1,026.74 mi (1,652.37 km) |
| Hermiston to Oroville (California) | 452.54 mi (728.29 km) |
| Hermiston to Oshkosh (Wisconsin) | 1,498.81 mi (2,412.11 km) |
| Hermiston to Oskaloosa (Iowa) | 1,363.54 mi (2,194.40 km) |
