There are 5 US Post Offices in Holt County serving a total of 4,867 residents equating to 973 residents per post office. It's estimated that approximately 7,768 packages are handled across the 5 county post offices annually. Holt County is a county located in the northwestern portion of the U.S. state of Missouri. As of the 2010 census, the population was 4,912. Its county seat is Oregon. The county was organized February 15, 1841. Originally named Nodaway County, it was soon renamed for David Rice Holt (1803\u20131840), a Missouri state legislator from Platte County."