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Mason County
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Not who you're looking for? Others named Mason County: county in Michigan, United States · county in the state of Washington, United States · county in West Virginia, United States · county in Texas, United States
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 the adoption of the United States Bill of Rights.
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