Dupo Map
Dupo is a village in St. Clair County, Illinois, United States. The population was 3,933 at the 2000 census. The village was settled in about 1750 and was incorporated in 1876. Its name is derived from Prairie du Pont (French: Bridge Prairie).
Dupo is located at 38°30?57?N 90°12?29?W / 38.51583°N 90.20806°W / 38.51583; -90.20806 (38.515702, -90.207992). It is located in the American Bottom floodplain of the Mississippi River.
According to the United States Census Bureau, the village has a total area of 4.4 square miles (11.5 km²),
Nearby cities include East Carondelet, Brentwood, Washington Park, Venice, Arnold.