Havana is a city located in Mason County, Illinois, and serves as the county seat of the region. The city is situated in the central part of Illinois, within the United States.
According to the 2020 census, Havana had a population of 2,963 residents, representing a decline from the 3,301 people counted in the 2010 census. As the county seat, Havana serves as the administrative and governmental center for Mason County.