| County: | Moultrie County |
| State: | Illinois |
| Flag: | File:Flag of Fort Moultrie, South Carolina.svg |
| Founded: | February 16, 1843 |
| Seat Wl: | Sullivan |
| Largest City: | Sullivan |
| Area Total Sq Mi: | 344 |
| Area Land Sq Mi: | 336 |
| Area Water Sq Mi: | 8.5 |
| Area Percentage: | 2.5 |
| Population As Of: | 2020 |
| Population Total: | 14,526 |
| Pop Est As Of: | 2021 |
| Pop Est Footnotes: | [1] |
| Population Est: | 14510 |
| Population Density Sq Mi: | auto |
| Time Zone: | Central |
| Web: | http://www.moultriecountyil.com/ |
| Ex Image: | Moultrie County Courthouse, western side from south.jpg |
| Ex Image Cap: | Moultrie County Courthouse in Sullivan |
| District: | 15th |
| Named For: | William Moultrie |
Moultrie County is a county in the U.S. state of Illinois. According to the 2020 United States Census, its population was 14,526. Its county seat is Sullivan.[2] The name is pronounced as in "mole tree", unlike the pronunciation of its namesake, the South Carolinian Revolutionary War hero William Moultrie.
Moultrie County was formed in 1843 with areas taken from Shelby and Macon counties. It is named for South Carolina General, and later Governor, William Moultrie. General Moultrie defended Sullivan's Island, South Carolina from British attack in 1776. The site was later renamed Fort Moultrie. Nearby Jasper County was named for Sgt. William Jasper, another hero of the defense of Sullivan's Island.
The official flag of the county is the Moultrie Flag, which was flown over the new fortress on Sullivan's Island, when Moultrie defended it, and was designed by Moultrie. It went on to become iconic of liberty in the South.
When Abraham Kellar of Lovington, John Cook of Marrowbone, and John Fleming of Nelson proposed the formation of a new county from Macon, Shelby, and Coles counties, Macon gave up a strip of “worthless swamp” that is now among the most fertile land in the world, but Shelby and Coles voters refused to give up any land. Finally, Shelby County gave up some of its land to make a zig-zag border with Moultrie County.
According to the US Census Bureau, the county has a total area of, of which is land and (2.5%) is water.
In recent years, average temperatures in the county seat of Sullivan have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1915 and a record high of was recorded in July 1936. Average monthly precipitation ranged from in February to in June.
As of the 2010 United States Census, there were 14,846 people, 5,758 households, and 4,053 families living in the county.[3] The population density was . There were 6,260 housing units at an average density of .[4] The racial makeup of the county was 98.5% white, 0.3% black or African American, 0.2% Asian, 0.2% American Indian, 0.2% from other races, and 0.6% from two or more races. Those of Hispanic or Latino origin made up 0.9% of the population.[3] In terms of ancestry, 23.8% were German, 12.0% were Irish, 11.4% were American, and 10.9% were English.[5]
Of the 5,758 households, 31.8% had children under the age of 18 living with them, 57.6% were married couples living together, 8.9% had a female householder with no husband present, 29.6% were non-families, and 25.5% of all households were made up of individuals. The average household size was 2.51 and the average family size was 3.01. The median age was 40.3 years.[3]
The median income for a household in the county was $46,364 and the median income for a family was $54,494. Males had a median income of $42,581 versus $26,799 for females. The per capita income for the county was $22,954. About 6.2% of families and 11.0% of the population were below the poverty line, including 17.2% of those under age 18 and 6.7% of those age 65 or over.[6]
Moultrie County is served by three school districts.
Moultrie County voters have voted for the Republican Party candidate in eight of the last ten national election campaigns.