There are 6 US Post Offices in Ray County serving a total of 19,780 residents equating to 3,297 residents per post office. It's estimated that approximately 31,571 packages are handled across the 6 county post offices annually. Ray County is a county located in the northwestern portion of the U.S. state of Missouri. As of the 2010 census, the population was 23,494. Its county seat is Richmond. The county was organized November 16, 1820 and named for John Ray, a Missouri state legislator and member of the first state Constitutional Convention. Ray County is part of the Kansas City, MO-KS Metropolitan Statistical Area."