There are 7 US Post Offices in Kent County serving a total of 21,560 residents equating to 3,080 residents per post office. It's estimated that approximately 34,412 packages are handled across the 7 county post offices annually. Kent County is a county located in the U.S. state of Maryland. As of the 2010 census, its population was 20,197, making it the least populous county in Maryland. Its county seat is Chestertown. The county was named for the county of Kent in England. The county is located on Maryland's Eastern Shore.