Effingham County is located in the south central part of the U.S. state Illinois. As of the 2020 census, the population was 34,668.^[1] Its county seat and largest city is Effingham. Some other cities in Effingham County, Illinois include Altamont, Teutopolis, Beecher City, Montrose, Dieterich, Shumway, Watson, Mason, and Edgewood. Effingham County comprises the Effingham, IL Micropolitan Statistical Area.^[2]

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Effingham County
County
Effingham County Government Center and Jail in Effingham
Seal
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 39°04′N 88°35′W
Country	United States
State	Illinois
Founded	1831
Named for	Thomas Howard, 3rd Earl of Effingham
Seat	Effingham
Largest city	Effingham
Area
• Total	480 sq mi (1,200 km2)
• Land	479 sq mi (1,240 km2)
• Water	1.2 sq mi (3 km2)  0.3%
Population  (2020)
• Total	34,668
• Density	72/sq mi (28/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	12th
Website	www.effinghamcountyil.gov

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This section does not cite any sources. (January 2015)

Effingham County was formed in 1831 out of Fayette and Crawford counties. It may have been named after Thomas Howard, 3rd Earl of Effingham, who resigned his commission as general in the British army in 1775, refusing to serve in the war against the Colonies. The name is Anglo-Saxon for "Effa's house". New information suggests that the county was named after a surveyor who surveyed the area whose last name was Effingham. There is no written proof that the county was named after Lord Effingham.

Effingham County is governed by a board of elected representatives.^[3] The current Effingham County Board Chairman is Joshua Douthit (Republican) elected in 2022 from District B.

According to the U.S. Census Bureau, the county has a total area of 480 square miles (1,200 km²), of which 479 square miles (1,240 km²) is land and 1.2 square miles (3.1 km²) (0.3%) is water.^[4]

Just west of Effingham on Interstate 70 there is a 198-foot (60 m) white cross; 35,000 vehicles are estimated to pass the site each day. It is one of the world's tallest crosses, and took over 200 short tons (180 t) of steel to erect.

As of the 2010 United States Census, there were 34,242 people, 13,515 households, and 9,302 families residing in the county.^[11] The population density was 71.5 inhabitants per square mile (27.6/km²). There were 14,570 housing units at an average density of 30.4 per square mile (11.7/km²).^[4] The racial makeup of the county was 97.6% white, 0.4% Asian, 0.2% black or African American, 0.1% American Indian, 0.8% from other races, and 0.8% from two or more races. Those of Hispanic or Latino origin made up 1.7% of the population.^[11] In terms of ancestry, 41.6% were German, 10.0% were Irish, 9.3% were American, and 8.8% were English.^[12]

Of the 13,515 households, 32.7% had children under the age of 18 living with them, 54.9% were married couples living together, 9.5% had a female householder with no husband present, 31.2% were non-families, and 26.9% of all households were made up of individuals. The average household size was 2.50 and the average family size was 3.03. The median age was 39.2 years.^[11]

The median income for a household in the county was $49,509 and the median income for a family was $61,373. Males had a median income of $40,951 versus $28,209 for females. The per capita income for the county was $24,843. About 7.8% of families and 10.5% of the population were below the poverty line, including 14.1% of those under age 18 and 7.4% of those age 65 or over.^[13]

In its early years Effingham County was owing to its anti-Civil War German-American population powerfully Democratic. Until Woodrow Wilson’s harsh policies towards Germany following World War I drove many voters to the GOP’s Warren G. Harding, it had voted an absolute majority to the Democratic presidential candidate in every election since the county’s formation. Opposition to the New Deal caused a considerable swing away from Franklin D. Roosevelt in 1936, and combined with local opposition to Roosevelt’s war policies in 1940 to cause FDR to only win the county by forty-seven votes from Wendell Willkie.

Since that election, the county has voted Republican in every election except 1948 and 1964, and no Democrat since Jimmy Carter in 1976 has reached 35 percent of the county’s vote. Currently Effingham County is one of Illinois’ most Republican counties, rivalled by a number of southern counties like Edwards. In the 2008 U.S. presidential election, John McCain carried the county by a 36% margin over Barack Obama, making it McCain's strongest county in the state, with Obama carrying his home state by a 25.1% margin over McCain.^[14]

Currently all elected officials holding major offices in Effingham County are Republican with 8 of 9 elected County Board Representatives being Republican.

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