Freeport is the county seat and largest city of Stephenson County, Illinois. The population was 25,638 at the 2010 census, and the mayor of Freeport is James Gitz, elected in 2013. Freeport is known for hosting the second Lincoln-Douglas debate of 1858, and as "Pretzel City, USA", named after the heritage of its Germanic settlers in the 1850s and the Billerbeck Bakery pretzel company that started as a result of their arrival. Freeport High School's mascot is the Pretzel to honor this unique heritage.