There are 7 US Post Offices in Henry County serving a total of 23,808 residents equating to 3,401 residents per post office. It's estimated that approximately 38,000 packages are handled across the 7 county post offices annually. Henry County is a county located in the western portion of the U.S. state of Missouri. As of the 2010 census, the population was 22,272. Its county seat is Clinton. The county was organized December 13, 1834 as Rives County but was renamed in 1841 for Revolutionary War patriot Patrick Henry. The county originally had been named after William Cabell Rives, who was then serving as a U.S. Senator from Virginia. However, Rives lost popularity in Missouri after he joined the Whig Party.