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Sponsored Topics. Alton is a city on the Mississippi River in Madison County, Illinois, United States, about 15 miles (24 km) north of St. Louis, Missouri. The population was 27,865 at the 2010 census. It is a part of the Metro-East region of the Greater St. Louis metropolitan area in Southern Illinois.
Alton is part of the McAllenâEdinburgâMission and ReynosaâMcAllen metropolitan areas. As of the census of 2000, there were 4,384 people, 1,059 households, and 988 families residing in the city. The population density was 2,075.5 people per square mile (802.2/kmÂ²).