There are 6 US Post Offices in Miami County serving a total of 39,040 residents equating to 6,507 residents per post office. It's estimated that approximately 62,312 packages are handled across the 6 county post offices annually. Miami County (county code MI) is a county located in east-central Kansas. As of the 2010 census, the county population was 32,787. Its county seat and most populous city is Paola."