East Alton is a village in Madison County, Illinois, United States. The population was 5,786 at the 2020 census, down from 6,301 in 2010. East Alton was incorporated as a village in 1893. William Cobb, namesake of Cobb Street, was one of the first mayors, from 1895 to 1896, and again in 1902–1905.
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