Jasper County is a county located in the U.S. state of Illinois. According to the 2020 census, it has a population of 9,287.^[1] Its county seat is Newton.^[2]

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Jasper County
County
Jasper County Courthouse in Newton
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 39°01′N 88°09′W
Country	United States
State	Illinois
Founded	1831
Named for	William Jasper
Seat	Newton
Largest city	Newton
Area
• Total	498 sq mi (1,290 km2)
• Land	495 sq mi (1,280 km2)
• Water	3.6 sq mi (9 km2)  0.7%
Population  (2020)
• Total	9,287
• Density	19/sq mi (7.2/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	12th

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Jasper County was formed in 1831 out of Clay and Crawford Counties. It was named for Sgt. William Jasper, a Revolutionary War hero from South Carolina. During the defense of Fort Moultrie in 1776, the staff of the American flag was shot away. Sgt. Jasper attached the flag to a pole and stood on the wall waving the flag at the British until a new staff was erected.

• Jasper County at the time of its creation in 1831

According to the U.S. Census Bureau, the county has a total area of 498 square miles (1,290 km²), of which 495 square miles (1,280 km²) is land and 3.6 square miles (9.3 km²) (0.7%) is water.^[3]

As of the 2010 United States Census, there were 9,698 people, 3,940 households, and 2,800 families living in the county.^[11] The population density was 19.6 inhabitants per square mile (7.6/km²). There were 4,345 housing units at an average density of 8.8 per square mile (3.4/km²).^[3] The racial makeup of the county was 98.6% white, 0.2% Asian, 0.1% American Indian, 0.1% black or African American, 0.3% from other races, and 0.6% from two or more races. Those of Hispanic or Latino origin made up 0.8% of the population.^[11] In terms of ancestry, 39.5% were German, 12.5% were American, 11.0% were Irish, and 9.1% were English.^[12]

Of the 3,940 households, 29.7% had children under the age of 18 living with them, 59.1% were married couples living together, 7.9% had a female householder with no husband present, 28.9% were non-families, and 24.5% of all households were made up of individuals. The average household size was 2.45 and the average family size was 2.90. The median age was 42.7 years.^[11]

The median income for a household in the county was $46,546 and the median income for a family was $53,034. Males had a median income of $39,167 versus $24,856 for females. The per capita income for the county was $21,467. About 6.3% of families and 8.5% of the population were below the poverty line, including 10.6% of those under age 18 and 5.1% of those aged 65 or over.^[13]

Jasper County is largely served by Jasper County Community Unit School District 1, which is based in its county seat, Newton. Five of the district's six schools are located in Jasper County. Saint Thomas Catholic School is a private elementary school, also in Newton.

• Glenn Brummer, baseball catcher for the Major League Baseball St. Louis Cardinals and Texas Rangers; member of the 1982 World Champion Cardinals
• Irene Hunt, author of the classic Across Five Aprils
• Albert Isley, Illinois judge, lawyer, and state senator
• Burl Ives, folk singer, author, and actor
• Ross Wolf, baseball pitcher; plays for the SK Wyverns of the Korea Baseball Championship; formerly played for several Major League Baseball teams

Jasper is politically a fairly typical "anti-Yankee" Southern Illinois county. Opposition to the "Yankee" Republican Party and that party's Civil War meant that Jasper County voted solidly Democratic until isolationist sentiment drove its voters to Warren G. Harding in 1920.

Since the New Deal, the county has shown a steady trend away from the Democratic Party due to major shifts in that party's views – initially on economic policies and since the 1990s on social issues.^[14] Only one Democrat, Lyndon Johnson, has won a majority since 1940 in his 1964 landslide. It appears to be a statistical change in the Upland South, that Barack Obama in 2012 and Hillary Clinton in 2016 did far worse than any previous Democrat candidates for president.

• National Register of Historic Places listings in Jasper County, Illinois