|Mason County Illinois Cities/Towns - Bath, Easton, Forest City, Havana (County Seat), Kilbourne, Manito, Mason City, Topeka
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Mason County is a county located in the U.S. state of Illinois. As of 2016, the population was 13,507. 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.