There are 8 US Post Offices in Dickinson County serving a total of 20,096 residents equating to 2,512 residents per post office. It's estimated that approximately 32,075 packages are handled across the 8 county post offices annually. Dickinson County (county code DK) is a county located in Central Kansas. As of the 2010 census, the county population was 19,754. Its county seat and most populous city is Abilene. The county was named in honor of Daniel S. Dickinson."