There are 5 US Post Offices in Steele County serving a total of 37,189 residents equating to 7,438 residents per post office. It's estimated that approximately 59,358 packages are handled across the 5 county post offices annually. Steele County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 36,576. Its county seat is Owatonna. The county was named for Franklin Steele, a prominent early resident of the state. Steele County comprises the Owatonna, MN Micropolitan Statistical Area."