Freeport is the county seat and largest city of Stephenson County, Illinois, United States. The population was 23,973 at the 2020 census, and the mayor of Freeport is Jodi Miller, elected in 2017. Freeport is known for hosting the second Lincoln–Douglas debate of 1858, and as "Pretzel City, USA", due to a popular local German bakery that became well known for its prolific pretzel production after it opened in 1869. Freeport High School's mascot is the Pretzel to honor its heritage.