There are 6 US Post Offices in Humboldt County serving a total of 17,203 residents equating to 2,867 residents per post office. It's estimated that approximately 27,458 packages are handled across the 6 county post offices annually. Humboldt County is a county located in the U.S. state of Nevada. As of the 2010 census, the population was 16,528. Its county seat is Winnemucca. Humboldt County comprises the 'Winnemucca, NV Micropolitan Statistical Area."