|Macon County, Illinois|
Location in the U.S. state of Illinois
Illinois's location in the U.S.
|Named for||Nathaniel Macon|
|• Total||586 sq mi (1,518 km2)|
|• Land||581 sq mi (1,505 km2)|
|• Water||5.2 sq mi (13 km2), 0.9%|
|• ( 2010)||110,768|
|• Density||191/sq mi (74/km2)|
|Time zone||Central: UTC−6/ −5|
Macon County comprises the Decatur, IL Metropolitan Statistical Area.
Macon County was formed on January 19, 1829 out of Shelby County. It was named for Nathaniel Macon, who served as a Colonel in the Revolutionary War.  Macon later served as senator from North Carolina until his resignation in 1828. In 1830, future President Abraham Lincoln and his family moved to Macon County.
Macon County is primarily flat, as is most of the state and all of the surrounding counties, the result of geological activity during the Pleistocene epoch. During the Illinoian Stage of the Pleistocene, the Laurentide ice sheet covered roughly 85 percent of Illinois, including all of present-day Macon County. The subsequent thaw of the region and retreat of the ice sheet left central Illinois with the characteristic flat topography which it is known for today. 
Because of its central location, Macon County is often referred to as "The Heart of Illinois." 
|Climate chart ( explanation)|
In recent years, average temperatures in the county seat of Decatur have ranged from a low of 17 °F (−8 °C) in January to a high of 88 °F (31 °C) in July, although a record low of −25 °F (−32 °C) was recorded in February 1905 and a record high of 113 °F (45 °C) was recorded in July 1954. Average monthly precipitation ranged from 1.95 inches (50 mm) in February to 4.54 inches (115 mm) in July. 
- Interstate 72
- U.S. Route 36
- U.S. Route 51
- Illinois Route 48
- Illinois Route 105
- Illinois Route 121
- Illinois Route 128
- De Witt - north
- Piatt - northeast
- Moultrie - southeast
- Shelby - south
- Christian - southwest
- Sangamon - west
- Logan - northwest
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2013 
As of the 2010 United States Census, there were 110,768 people, 45,855 households, and 29,326 families residing in the county.  The population density was 190.8 inhabitants per square mile (73.7/km2). There were 50,475 housing units at an average density of 86.9 per square mile (33.6/km2).  The racial makeup of the county was 79.3% white, 16.3% black or African American, 1.0% Asian, 0.2% American Indian, 0.7% from other races, and 2.5% from two or more races. Those of Hispanic or Latino origin made up 1.9% of the population.  In terms of ancestry, 21.7% were German, 17.0% were American, 12.9% were Irish, and 10.8% were English. 
Of the 45,855 households, 29.5% had children under the age of 18 living with them, 45.7% were married couples living together, 14.1% had a female householder with no husband present, 36.0% were non-families, and 30.9% of all households were made up of individuals. The average household size was 2.33 and the average family size was 2.89. The median age was 40.3 years. 
The median income for a household in the county was $44,337 and the median income for a family was $57,570. Males had a median income of $48,570 versus $31,568 for females. The per capita income for the county was $24,726. About 10.3% of families and 15.7% of the population were below the poverty line, including 26.1% of those under age 18 and 6.5% of those age 65 or over. 
In its early years Macon County favoured the Democratic Party, for whom it voted in every election up to 1856. Republican Abraham Lincoln won the county in his landmark 1860 election, and from then until the Great depression Macon County became solidly Republican, only giving a very narrow plurality to Woodrow Wilson in 1912 when the GOP was mortally divided.
The New Deal saw the county turn Democratic again due to its strong industrial base, although Macon was a perfect bellwether between 1932 and 1996 apart from the Catholicism-influenced 1960 election and the 1988 election heavily influenced by a major Midwestern drought. Al Gore did narrowly hold the county in 2000 despite losing the election due to a razor-thin loss in Florida, but since then the county has trended Republican. Illinois-bred Barack Obama did win Macon County in his 2008 triumph, but was convincingly defeated by Mitt Romney in 2012, whilst in 2016 Hilary Clinton suffered the worst Democratic loss since George McGovern.
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