There are 4 US Post Offices in Pawnee County serving a total of 6,895 residents equating to 1,724 residents per post office. It's estimated that approximately 11,005 packages are handled across the 4 county post offices annually. Pawnee County (standard abbreviation: PN) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 6,973. The largest city and county seat is Larned."