Williamson County is a county located in the southern part of the U.S. state of Illinois. According to the 2010 census, it had a population of 66,357. Its county seat is Marion.Williamson County is included in the Carbondale-Marion, IL Metropolitan Statistical Area. It is located in an area known as Little Egypt.Williamson is a rapidly growing county in the Metro Lakeland area and is located 88 miles (142 km) southeast of St. Louis, Missouri.
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