There are 7 US Post Offices in Saline County serving a total of 60,166 residents equating to 8,595 residents per post office. It's estimated that approximately 96,032 packages are handled across the 7 county post offices annually. Saline County (standard abbreviation: SA) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 55,606. The largest city and county seat is Salina."