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Mascoutah was the United States center of population point in 1970. As of the census of 2000, the Mascoutah IL real estate community was compromised of 5,659 people, 2,162 households, and 1,571 families residing in the city. The population density was 655.1 people per square mile (252.9/km²). There were 2,309 housing units at an average density of 267.3 per square mile (103.2/km²). The racial makeup of the city was 91.73% White, 4.19% African American, 0.35% Native American, 0.97% Asian, 0.05% Pacific Islander, 0.85% from other races, and 1.86% from two or more races. Hispanic or Latino of any race were 1.75% of the population.
There were 2,162 households out of which 35.8% had children under the age of 18 living with them, 57.5% weremarried couples living together, 11.2% had a female householder with no husband present, and 27.3% were non-families. 23.7% of all households were made up of individuals and 10.5% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 3.05.
In the city the population was spread out with 26.4% under the age of 18, 8.5% from 18 to 24, 29.4% from 25 to 44, 21.5% from 45 to 64, and 14.2% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 92.4 males. For every 100 females age 18 and over, there were 90.1 males.
The median income for a household in the city was $46,451, and the median income for a family was $55,018. Males had a median income of $37,182 versus $23,156 for females. The per capita income for the city was $21,569. About 6.3% of families and 7.8% of the population were below the poverty line, including 11.8% of those under age 18 and 7.9% of those age 65 or over making up the Mascoutah IL real estate demographic.