There are 10 US Post Offices in Keokuk County serving a total of 8,507 residents equating to 851 residents per post office. It's estimated that approximately 13,578 packages are handled across the 10 county post offices annually. Keokuk County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 10,511. The county seat is Sigourney."