Warren County, Illinois Facts for Kids

Quick facts for kids Warren County
U.S. county
Warren County Courthouse in Monmouth
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Country	United States
State	Illinois
Founded	1825
Named for	Joseph Warren
Seat	Monmouth
Largest city	Monmouth
Area
• Total	543 sq mi (1,410 km²)
• Land	542 sq mi (1,400 km²)
• Water	0.6 sq mi (2 km²) 0.1%
Population (2010)
• Total	17,707
• Estimate (2018)	17,032
• Density	32.610/sq mi (12.591/km²)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	17th

Warren County is a county in the U.S. state of Illinois. According to the 2010 census, it had a population of 17,707. Its county seat is Monmouth.

History
Geography
- Climate and weather
- Adjacent counties
Demographics
Transportation
- Airport
- Major highways
Communities
See also

History

Warren County was organized in 1825 out of Pike County which consisted of all portions of the state north and west of the Illinois River before 1825. Henderson County was formed in 1841 from the western area of Warren County.

Warren County was named for Dr. Joseph Warren, killed at the Battle of Bunker Hill in 1775. He is believed to have been the first officer to die in the Revolutionary War.

The current courthouse, constructed of red Portage stone, was completed in 1895.

Warren County from the time of its creation to 1831
Between 1831 and 1835, Mercer County was temporarily attached to Warren until it could organize its own county government.
Warren County between 1835 and 1841
Warren County in 1841, reduced to its current borders by the creation of Henderson County

Geography

According to the U.S. Census Bureau, the county has a total area of 543 square miles (1,410 km²), of which 542 square miles (1,400 km²) is land and 0.6 square miles (1.6 km²) (0.1%) is water.

Climate and weather

Weather chart for Monmouth, 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
41 -1 -9	44 3 -6	72 9 -1	96 17 5	108 23 11	108 27 16	110 29 18	102 28 17	88 25 12	75 18 6	70 9 0	59 2 -7
temperatures in °C • precipitation totals in mm

In recent years, average temperatures in the county seat of Monmouth have ranged from a low of 15 °F (−9 °C) in January to a high of 85 °F (29 °C) in July, although a record low of −27 °F (−33 °C) was recorded in February 1905 and a record high of 110 °F (43 °C) was recorded in July 1936. Average monthly precipitation ranged from 1.62 inches (41 mm) in January to 4.33 inches (110 mm) in July.

Adjacent counties

Mercer County (north)
Knox County (east)
Fulton County (southeast)
McDonough County (south)
Henderson County (west)

Demographics

Historical population
Census	Pop.	%±
1830	308	—
1840	6,739	2,088.0%
1850	8,176	21.3%
1860	18,336	124.3%
1870	23,174	26.4%
1880	22,933	−1.0%
1890	21,281	−7.2%
1900	23,163	8.8%
1910	23,313	0.6%
1920	21,488	−7.8%
1930	21,745	1.2%
1940	21,286	−2.1%
1950	21,981	3.3%
1960	21,587	−1.8%
1970	21,595	0.0%
1980	21,943	1.6%
1990	19,181	−12.6%
2000	18,735	−2.3%
2010	17,707	−5.5%
2018 (est.)	17,032	−3.8%
U.S. Decennial Census 1790-1960 1900-1990 1990-2000 2010-2013

At the 2010 United States Census, there were 17,707 people, 6,918 households and 4,617 families residing in the county. The population density was 32.6 inhabitants per square mile (12.6/km²). There were 7,682 housing units at an average density of 14.2 per square mile (5.5/km²). The racial makeup of the county was 91.3% white, 1.7% black or African American, 0.5% Asian, 0.2% American Indian, 0.1% Pacific islander, 4.5% from other races, and 1.6% from two or more races. Those of Hispanic or Latino origin made up 8.4% of the population. In terms of ancestry, 25.2% were German, 14.7% were Irish, 11.3% were English, 10.0% were Swedish, and 5.5% were American.

Of the 6,918 households, 29.6% had children under the age of 18 living with them, 52.2% were married couples living together, 9.7% had a female householder with no husband present, 33.3% were non-families, and 28.2% of all households were made up of individuals. The average household size was 2.40 and the average family size was 2.91. The median age was 39.6 years.

The median household income was $41,636 and the median family income was $49,623. Males had a median income of $40,289 and females $25,460. The per capita incomewas $20,047. About 11.0% of families and 13.4% of the population were below the poverty line, including 18.1% of those under age 18 and 10.6% of those age 65 or over.