Grundy County is a county in the U.S. state of Illinois. According to the 2010 census, it has a population of 50,063. Its county seat is Morris. Grundy County is part of the Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area. In 2010, the center of population of Illinois was in Grundy County, just northeast of the village of Mazon. Illinois's state fossil, the unique and bizarre Tully Monster, was first found in Mazon Creek. Grundy County Speedway is located in Morris. Grundy County is also home to Dresden Generating Station—the first privately financed nuclear power plant built in the United States—and the Morris Operation—the only de facto high-level radioactive waste storage site in the United States.
According to the U.S. Census Bureau, the county has a total area of 430 square miles (1,100 km²), of which 418 square miles (1,080 km²) is land and 12 square miles (31 km²) (2.9%) is water.
As of the 2010 United States Census, there were 50,063 people, 18,546 households, and 13,431 families residing in the county. The population density was 119.8 inhabitants per square mile (46.3/km²). There were 19,996 housing units at an average density of 47.8 per square mile (18.5/km²). The racial makeup of the county was 93.7% white, 1.2% black or African American, 0.7% Asian, 0.2% American Indian, 2.7% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 8.2% of the population. In terms of ancestry, 28.3% were German, 23.0% were Irish, 12.7% were Italian, 9.4% were Polish, 8.6% were English, 7.1% were Norwegian, and 3.0% were American.
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