There are 3 US Post Offices in Norton County serving a total of 5,507 residents equating to 1,836 residents per post office. It's estimated that approximately 8,790 packages are handled across the 3 county post offices annually. Norton County (standard abbreviation: NT) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 5,671. The largest city and county seat is Norton. The county was established in 1867 and named for Orloff Norton, captain of Company L, 15th Kansas Militia Infantry Regiment."