There are 34 US Post Offices in Jackson County serving a total of 497,694 residents equating to 14,638 residents per post office. It's estimated that approximately 794,375 packages are handled across the 34 county post offices annually. Jackson County is a county located in the western portion of the U.S. state of Missouri. As of the 2010 census, the population was 674,158. making it the second-most populous county in the state (after St. Louis County). Although Independence retains its status as the original county seat, Kansas City serves as a second county seat and the center of county government. The county was organized December 15, 1826 and named for President Andrew Jackson (elected 1828). Jackson County is the central county of the Kansas City, MO-KS Metropolitan Statistical Area."