Carroll County, Illinois Facts for Kids

Quick facts for kids Carroll County
U.S. county
Carroll County Courthouse
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Country	United States
State	Illinois
Founded	1839
Named for	Charles Carroll
Seat	Mount Carroll
Largest city	Savanna
Area
• Total	466 sq mi (1,210 km²)
• Land	445 sq mi (1,150 km²)
• Water	22 sq mi (60 km²) 4.6%
Population (2020)
• Total	15,702
• Estimate (2023)	15,526
• Density	33.70/sq mi (13.010/km²)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	17th

Carroll County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 15,702. Its county seat is Mount Carroll.

History
Geography
Climate and weather
Demographics
Education
Communities
Notable people
See also

History

Carroll County was formed in 1839 out of Jo Daviess County. The county is named for Charles Carroll who signed the Declaration of Independence. Carroll, who died in 1832, was the last signer to die.

Carroll County at the time of its creation in 1839

Geography

According to the U.S. Census Bureau, the county has a total area of 466 square miles (1,210 km²), of which 445 square miles (1,150 km²) is land and 22 square miles (57 km²) (4.6%) is water. The Mississippi Palisades State Park is in this county, just north of the city of Savanna. The Savanna Army Depot is located partly in this county.

Adjacent counties

Stephenson County - northeast
Ogle County - east
Whiteside County - south
Clinton County, Iowa - southwest
Jackson County, Iowa - west
Jo Daviess County - northwest

National protected area

Upper Mississippi River National Wildlife and Fish Refuge (part)

Major highways

US Route 52
Illinois Route 40
Illinois Route 64
Illinois Route 72
Illinois Route 73
Illinois Route 78
Illinois Route 84

Climate and weather

Weather chart for Mount Carroll, Illinois

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temperatures in °F
precipitation totals in inches
source: The Weather Channel

Metric conversion

J	F	M	A	M	J	J	A	S	O	N	D
36 -2 -14	39 2 -11	67 8 -4	93 16 2	110 22 8	121 28 12	97 29 15	115 28 13	88 24 8	69 18 2	72 8 -3	51 1 -10
temperatures in °C • precipitation totals in mm

In recent years, average temperatures in the county seat of Mount Carroll have ranged from a low of 7 °F (−14 °C) in January to a high of 85 °F (29 °C) in July, although a record low of −31 °F (−35 °C) was recorded in January 1910 and a record high of 108 °F (42 °C) was recorded in July 1936. Average monthly precipitation ranged from 1.43 inches (36 mm) in January to 4.77 inches (121 mm) in June.

Demographics

2000 census age pyramid for Carroll County.

Historical population
Census	Pop.	%±
1840	1,023	—
1850	4,586	348.3%
1860	11,733	155.8%
1870	16,705	42.4%
1880	16,976	1.6%
1890	18,320	7.9%
1900	18,963	3.5%
1910	18,035	−4.9%
1920	19,345	7.3%
1930	18,433	−4.7%
1940	17,987	−2.4%
1950	18,976	5.5%
1960	19,507	2.8%
1970	19,276	−1.2%
1980	18,779	−2.6%
1990	16,805	−10.5%
2000	16,674	−0.8%
2010	15,387	−7.7%
2020	15,702	2.0%
2023 (est.)	15,526	0.9%
U.S. Decennial Census 1790-1960 1900-1990 1990-2000 2010

As of the 2010 United States Census, there were 15,387 people, 6,622 households, and 4,343 families residing in the county. The population density was 34.6 inhabitants per square mile (13.4/km²). There were 8,437 housing units at an average density of 19.0 per square mile (7.3/km²). The racial makeup of the county was 96.9% white, 0.8% black or African American, 0.3% Asian, 0.3% American Indian, 0.6% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 2.8% of the population. In terms of ancestry, 40.4% were German, 14.0% were Irish, 11.2% were English, and 10.6% were American.

Of the 6,622 households, 26.3% had children under the age of 18 living with them, 53.1% were married couples living together, 8.2% had a female householder with no husband present, 34.4% were non-families, and 29.8% of all households were made up of individuals. The average household size was 2.29 and the average family size was 2.80. The median age was 46.5 years.

The median income for a household in the county was $44,805 and the median income for a family was $55,341. Males had a median income of $42,421 versus $27,552 for females. The per capita income for the county was $25,914. About 7.8% of families and 11.7% of the population were below the poverty line, including 18.4% of those under age 18 and 5.8% of those age 65 or over.

Education

Chadwick-Milledgeville Community Unit School District 399
Eastland Community Unit School District 308
West Carroll Community Unit School District 314

Communities

Community	Community type	Population	Total Area	Water Area	Land Area	Pop. Density
Chadwick	village	481	0.31	0.00	0.31	1,546.62
Lanark	city	1,504	1.12	0.00	1.12	1,341.66
Milledgeville	village	1,026	0.69	0.00	0.69	1,486.96
Mount Carroll (seat)	city	1,479	2.00	0.00	2.00	738.39
Savanna	city	2,783	2.71	0.09	2.62	1,063.84
Shannon	village	801	0.48	0.00	0.48	1,661.83
Thomson	village	1,610	2.22	0.00	2.22	725.55
Carroll County	county	15,702	466	22	445	34

Townships

Carroll County is divided into these twelve townships:

Cherry Grove-Shannon
Elkhorn Grove
Fairhaven
Freedom
Mount Carroll
Rock Creek-Lima
Salem
Savanna
Washington
Woodland
Wysox
York

Census designated place

Lake Carroll

Unincorporated Communities

Notable people

John Acker, Illinois state representative, was born on a farm near Savanna.
Willis J. Bailey, United States Representative from Kansas and the 16th Governor of Kansas
Neva Burright, Illinois harness racing driver and first woman to win a Grand Circuit race
David J. Summerville, Wisconsin State Assemblyman

Carroll County, Illinois facts for kids

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