There are 10 US Post Offices in Malheur County serving a total of 24,975 residents equating to 2,498 residents per post office. It's estimated that approximately 39,863 packages are handled across the 10 county post offices annually. Malheur County /m\u00e6l\u02c8h\u026a\u0259r/ is a county located in the southeast corner of the U.S. state of Oregon. As of the 2010 census, the population was 31,313. Its county seat is Vale, and its largest city is Ontario. The county was named after the Malheur River, which runs through the county. \"Malheur\" is French for misfortune or tragedy. Malheur County is included in the Ontario, OR-ID Micropolitan Statistical Area, which is also included in the Boise City-Mountain Home-Ontario, ID-OR Combined Statistical Area. It is included in the eight-county definition of Eastern Oregon."