Grundy County, Illinois

Grundy County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 52,533. Its county seat is Morris.

Grundy County
Grundy County Courthouse
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 41°17′N 88°26′W
Country United States
State Illinois
FoundedFebruary 17, 1841
Named forFelix Grundy
SeatMorris
Largest cityMorris
Area
  Total430 sq mi (1,100 km2)
  Land418 sq mi (1,080 km2)
  Water12 sq mi (30 km2)  2.9%
Population
 (2020)
  Total52,533
  Density120/sq mi (47/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district16th
Websitewww.grundyco.org

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 is 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.

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