There are 6 US Post Offices in Dodge County serving a total of 19,795 residents equating to 3,299 residents per post office. It's estimated that approximately 31,595 packages are handled across the 6 county post offices annually. Dodge County is a county located in the U.S. state of Minnesota. The population was 20,087 as of the 2010 census. Its county seat is Mantorville. Dodge County is part of the Rochester, MN Metropolitan Statistical Area."