Emergency Biohazard Cleanup Services in Dupo, IL

Dupo is a village in St. Clair County, Illinois, located in the American Bottom floodplain of the Mississippi River.

Dupo was settled in about 1750 as the French village of Prairie du Pont, founded by townspeople moving out of Cahokia to higher ground about 10 to 12 feet above Cahokia, which offered more protection from Mississippi River floods.

The modern name Dupo, adopted in the early 20th century, is shortened from Prairie du Pont, French for Bridge Prairie, after a bridge over Prairie du Pont Creek on the Cahokia-to-Kaskaskia trail, the first wagon road in Illinois.

In the Mississippian period, the Dupo site was one of several multi-mound communities in the floodplain near Cahokia, and its mounds were still standing at least as recently as 1915.

The Sulpician mission established a mill near Falling Springs, also called St. Michael's Bluff, in the 18th century, which became the core of the town's development, and by 1765 fourteen families lived in Prairie du Pont.

Dupo was incorporated in 1907, after the railroad was extended to the area around 1905 and spurred the modern village's growth.

As of the 2020 census, Dupo had a population of 3,996, and as of the 2000 census there were 3,933 people and 1,557 households in the village, with an average household size of 2.53 people.