Johnson County, Illinois

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Johnson County is a county located in the U.S. state of Illinois. As of 2000, the population was 12,878. Its county seat is Vienna, Illinois[1].



According to the U.S. Census Bureau, the county has a total area of 349 square miles (903.9 km2), of which 345 square miles (893.5 km2) is land and 4 square miles (10.4 km2) (1.22%) is water.

Major highways

Adjacent counties

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