Grundy County, Illinois facts for kids
Quick facts for kids
Grundy County
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Grundy County Courthouse
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Location within the U.S. state of Illinois
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 Illinois's location within the U.S. |
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| Country |  United States |
| State |  Illinois |
| Founded | February 17, 1841 |
| Named for | Felix Grundy |
| Seat | Morris |
| Largest city | Morris |
| Area | |
| • Total | 430 sq mi (1,100 km2) |
| • Land | 418 sq mi (1,080 km2) |
| • Water | 12 sq mi (30 km2) 2.9% |
| Population
(2010)
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| • Total | 50,063 |
| • Estimate
(2018)
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50,972 |
| • Density | 116.4/sq mi (45.0/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 16th |
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.
Contents
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.
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Grundy County at the time of its creation in 1841
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 | |||||||||||||||||||||||||||||||||||||||||||||||
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| J | F | M | A | M | J | J | A | S | O | N | D | ||||||||||||||||||||||||||||||||||||
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1.8
30
13
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1.6
35
18
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2.7
47
29
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3.5
61
39
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4
73
50
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4.2
83
59
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3.7
85
63
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3.4
83
61
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3
76
53
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2.5
64
41
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3.1
48
31
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2.4
35
19
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| temperatures in °F precipitation totals in inches source: The Weather Channel |
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Metric conversion
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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
- Kendall (north)
- Will (east)
- Kankakee (southeast)
- Livingston (south)
- LaSalle (west)
Demographics
| Historical population | |||
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| 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% | |
| 2020 (est.) | 52,533 | 4.9% | |
| U.S. Decennial Census 1790-1960 1900-1990 1990-2000 2010-2013 |
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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
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
See also
In Spanish: Condado de Grundy (Illinois) para niños
