There are 9 US Post Offices in Jones County serving a total of 22,744 residents equating to 2,527 residents per post office. It's estimated that approximately 36,302 packages are handled across the 9 county post offices annually. Jones County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 20,638. The county seat is Anamosa. The county was founded in 1837 and named after George Wallace Jones, a United States Senator and member of Congress. Jones County is included in the Cedar Rapids, IA Metropolitan Statistical Area."