Grundy County, Illinois facts for kids

Kids Encyclopedia Facts
Grundy County, Illinois
Map
Map of Illinois highlighting Grundy County
Location in the state of Illinois
Map of the USA highlighting Illinois
Illinois's location in the U.S.
Statistics
Founded February 17, 1841
Seat Morris
Largest City Morris
Area
 - Total
 - Land
 - Water

430 sq mi (1,114 km²)
418 sq mi (1,083 km²)
12 sq mi (31 km²), 2.9%
Population
 - (2010)
 - Density

50,063
120/sq mi (46/km²)
Time zone Central: UTC-6/-5
Named for: Felix Grundy

Grundy County is a county located 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 located 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.

History

Grundy County was established on February 17, 1841. It was formed out of LaSalle County and named after U.S. Attorney General Felix Grundy (1777-1840). The county was well known for its coal mines and attracted miners from Pennsylvania and other regions to work its deposits. Braidwood endured one major coal mining disaster. Most of the coal was destined for the Chicago area.

Geography

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.

Climate and weather

Weather chart for Morris, Illinois
J F M A M J J A S O N D
 
 
1.8
 
30
13
 
 
1.6
 
35
18
 
 
2.7
 
47
29
 
 
3.5
 
61
39
 
 
4
 
73
50
 
 
4.2
 
83
59
 
 
3.7
 
85
63
 
 
3.4
 
83
61
 
 
3
 
76
53
 
 
2.5
 
64
41
 
 
3.1
 
48
31
 
 
2.4
 
35
19
temperatures in °F
precipitation totals in inches
source: The Weather Channel

In recent years, average temperatures in the county seat of Morris have ranged from a low of 13 °F (−11 °C) in January to a high of 85 °F (29 °C) in July, although a record low of −24 °F (−31 °C) was recorded in January 1985 and a record high of 103 °F (39 °C) was recorded in June 1988. Average monthly precipitation ranged from 1.59 inches (40 mm) in February to 4.16 inches (106 mm) in June.

Major highways

  • I-55
  • I-80
  • US 6
  • IL 17
  • IL 47
  • IL 53
  • IL 113

Adjacent counties

Demographics

Historical population
Census Pop.
1850 3,023
1860 10,379 243.3%
1870 14,938 43.9%
1880 16,732 12.0%
1890 21,024 25.7%
1900 24,136 14.8%
1910 24,162 0.1%
1920 18,580 −23.1%
1930 18,678 0.5%
1940 18,398 −1.5%
1950 19,217 4.5%
1960 22,350 16.3%
1970 26,535 18.7%
1980 30,582 15.3%
1990 32,337 5.7%
2000 37,535 16.1%
2010 50,063 33.4%
Est. 2016 50,437 0.7%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2013
USA Grundy County, Illinois age pyramid
2000 census age pyramid for Grundy County

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.

Of the 18,546 households, 38.6% had children under the age of 18 living with them, 57.8% were married couples living together, 9.7% had a female householder with no husband present, 27.6% were non-families, and 22.5% of all households were made up of individuals. The average household size was 2.69 and the average family size was 3.16. The median age was 36.1 years.

The median income for a household in the county was $64,297 and the median income for a family was $75,000. Males had a median income of $58,491 versus $36,592 for females. The per capita income for the county was $27,895. About 5.2% of families and 6.9% of the population were below the poverty line, including 8.0% of those under age 18 and 6.5% of those age 65 or over.

Communities

Map of Grundy County, Illinois.

City

Villages

Townships

Grundy County is divided into seventeen townships:

  • Aux Sable
  • Braceville
  • Erienna
  • Felix
  • Garfield
  • Goodfarm
  • Goose Lake
  • Greenfield
  • Highland
  • Maine
  • Mazon
  • Morris
  • Nettle Creek
  • Norman
  • Saratoga
  • Vienna
  • Wauponsee

Unincorporated communities


Grundy County, Illinois Facts for Kids. Kiddle Encyclopedia.