| Hermiston to Oswego (Illinois) | 1,560.62 mi (2,511.57 km) |
| Hermiston to Oswego (New York) | 2,084.50 mi (3,354.68 km) |
| Hermiston to Otsego (Minnesota) | 1,237.10 mi (1,990.91 km) |
| Hermiston to Ottawa (Illinois) | 1,545.38 mi (2,487.04 km) |
| Hermiston to Ottawa (Kansas) | 1,320.51 mi (2,125.15 km) |
| Hermiston to Ottumwa (Iowa) | 1,381.43 mi (2,223.20 km) |
| Hermiston to Overland (Missouri) | 1,548.62 mi (2,492.26 km) |
| Hermiston to Overland Park (Kansas) | 1,337.79 mi (2,152.96 km) |
| Hermiston to Overlea (Maryland) | 2,193.32 mi (3,529.82 km) |
| Hermiston to Oviedo (Florida) | 2,376.54 mi (3,824.66 km) |
| Hermiston to Owasso (Oklahoma) | 1,381.16 mi (2,222.76 km) |
| Hermiston to Owatonna (Minnesota) | 1,273.73 mi (2,049.87 km) |
| Hermiston to Owensboro (Kentucky) | 1,734.69 mi (2,791.71 km) |
| Hermiston to Owings Mills (Maryland) | 2,178.74 mi (3,506.35 km) |
| Hermiston to Owosso (Michigan) | 1,729.72 mi (2,783.71 km) |
