There are 8 US Post Offices in Cedar County serving a total of 16,901 residents equating to 2,113 residents per post office. It's estimated that approximately 26,976 packages are handled across the 8 county post offices annually. Cedar County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 18,499. Its county seat is Tipton. The county is named for the Cedar River, which runs through the county. Cedar County is located between the Cedar Rapids, Quad Cities and Iowa City metropolitan areas, areas also known as the \"Tri-Metro\" county. It is the only Iowa county which shares the name of a tree. Cedar County was the focus of the Iowa Cow War of 1931."