Dupo is a village in St. Clair County, Illinois, United States. The population was 4,138 at the 2010 census, an increase from 3,933 in 2000. The village was settled in about 1750 and was incorporated in 1876. Its name is derived from Common Fields of Prairie du Pont (). Geography Dupo is located at (38.515702, -90.207992). It is located in the American Bottom floodplain of the Mississippi River. According to the 2010 census, Dupo has a total area of , all land. History Dupo had its start ca. 1905 when the railroad was extended to that point. The name is an abbreviation of DuPont. Demographics In 2010 there were 4,138 people, 1,650 households, and 1,142 families residing in the village. The Population Density was 655 people per square mile(252.8/km). There were 1,863 housing units at an average density of . The racial makeup of the village was 94.9% White, 2.3% African American, 0.4% Native American, 0.3% Asian, 0.3% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 1.4% of the population. There were 1,650 households, out of which 31.3% had children under the age of 18 living with them, 43.8% were married couples living together, 17.7% had a female householder with no husband present with 10.8% of all households having a female householder with kids. 7.7% had a male householder with no husband present with 4.2% of all households having a male householder with no wife and kids. 30.8% of all households were non-families. 25.3% of all households were made up of individuals, and 9.4% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 2.91. In Dupo, 25.3% of the population was under 18, 6.8% from 20 to 24, 28.5% from 25 to 44, 26.2% from 45 to 64 and 10.7% who were 65 years of age or older. The median age was 35 years, For every 100 females, there were 97.2 males. The median income for a household in the village was $45,203, and the median income for a family was $58,370. Males had an average income of $45,621 versus $32,628 for females. The Per Capita Income for the village was $24,404. About 14.0% of families and 14.9% of the population were below the poverty line, including 25.2% of those under 18 and 14.4% of those