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Join the roomJohnson County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 13,308. Its county seat is Vienna. It is located in the southern portion of Illinois known locally as "Little Egypt".
Not who you're looking for? Others named Johnson County: county in Iowa, United States · county in Texas, United States · county in Kentucky, United States · county in Tennessee, United States
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