Mason County
County in Illinois
Mason County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 13,086. Its county seat is Havana. The county is named in honor of George Mason, a member of the Virginia legislature who campaigned for... Wikipedia
Cities: Havana, Mason City, Kilbourne, and more
Population: 12,748 (2022)
County seat: Havana
Area: 563 mi²
Congressional district: 15th
Named for: George Mason