There are 10 US Post Offices in Door County serving a total of 27,226 residents equating to 2,723 residents per post office. It's estimated that approximately 43,456 packages are handled across the 10 county post offices annually. Door County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 27,785. Its county seat is Sturgeon Bay. The county was created in 1851 and organized in 1861. It is named after the strait between the Door Peninsula and Washington Island. The dangerous passage, which is now scattered with shipwrecks, was known to early French explorers and local Native Americans. Because of the natural hazards of the strait, where the waters of Green Bay meet the open body of Lake Michigan, they gave it the French appellation Porte des Morts, which in English means, literally, \"Door of the Dead\", or, more colloquially, \"Death's Door\". Door County is a popular vacation and tourist destination, especially for residents of Wisconsin and Illinois."