Black Hawk County
There are 10 US Post Offices in Black Hawk County serving a total of 116,370 residents equating to 11,637 residents per post office. It's estimated that approximately 185,740 packages are handled across the 10 county post offices annually. Black Hawk County is a county located in the northeastern part of U.S. state of Iowa. As of the 2010 census, the population was 131,090, making it the fourth-most populous county in Iowa. The county seat is Waterloo. Black Hawk County is included in the Waterloo-Cedar Falls, IA Metropolitan Statistical Area."