Blue Mound is a village in Macon County, Illinois, United States. The population was 1,133 at the 2020 census. It is included in the Decatur, Illinois Metropolitan Statistical Area.

Blue Mound is located in southwestern Macon County at 39°41′59″N 89°7′19″W / 39.69972°N 89.12194°W / 39.69972; -89.12194 (39.699677, -89.122075). Illinois Route 48 passes through the village, leading northeast 14 miles (23 km) to Decatur, the county seat, and southwest the same distance to Taylorville.

According to the U.S. Census Bureau, Blue Mound has a total area of 0.59 square miles (1.53 km), all land.

One and a half miles northwest of the village is the Blue Mound, a glacial kame, a cone-shaped gravel hill rising 80 feet (24 m) above the surrounding farmland. Surrounded by the Griswold Conservation Area, park and camping place, the mound is estimated to date from about 130,000 years ago in geologic time from melting of glacier ice. It is one of a group of glacial mounds in the Blue Mound area.

Historical population

Census	Pop.	Note	%±
1880	532		—
1890	696		30.8%
1900	714		2.6%
1910	900		26.1%
1920	881		−2.1%
1930	817		−7.3%
1940	811		−0.7%
1950	886		9.2%
1960	1,038		17.2%
1970	1,181		13.8%
1980	1,338		13.3%
1990	1,161		−13.2%
2000	1,129		−2.8%
2010	1,158		2.6%
2020	1,133		−2.2%
U.S. Decennial Census

As of the census of 2000, there were 1,129 people, 459 households, and 329 families residing in the village. The population density was 1,898.9 inhabitants per square mile (733.2/km). There were 483 housing units at an average density of 812.4 per square mile (313.7/km). The racial makeup of the village was 99.65% White, 0.18% Native American, 0.09% from other races, and 0.09% from two or more races. Hispanic or Latino of any race were 0.27% of the population.

There were 459 households, out of which 34.0% had children under the age of 18 living with them, 56.0% were married couples living together, 11.1% had a female householder with no husband present, and 28.3% were non-families. 24.6% of all households were made up of individuals, and 15.0% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 2.91.

In the village, the population was spread out, with 25.2% under the age of 18, 8.9% from 18 to 24, 28.8% from 25 to 44, 20.7% from 45 to 64, and 16.4% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 90.7 males. For every 100 females age 18 and over, there were 90.3 males.

The median income for a household in the village was $44,018, and the median income for a family was $49,432. Males had a median income of $36,354 versus $21,081 for females. The per capita income for the village was $20,039. About 2.7% of families and 4.2% of the population were below the poverty line, including 6.2% of those under age 18 and 4.0% of those age 65 or over.

• List of municipalities in Illinois

Media related to Blue Mound, Illinois at Wikimedia Commons