There are 5 US Post Offices in Coffey County serving a total of 8,540 residents equating to 1,708 residents per post office. It's estimated that approximately 13,631 packages are handled across the 5 county post offices annually. Coffey County (county code CF) is a county located in Eastern Kansas. As of the 2010 census, the county population was 8,601. Its county seat and most populous city is Burlington."