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Alton is located in Illinois. Alton, Illinois has a population of 26,215. Alton is less family-centric than the surrounding county with 26% of the households containing married families with children. The county average for households married with children is 27%.

The median household income in Alton, IL is $38,027. The median household income for the surrounding county is $56,477 compared to the national median of $57,525. The median age of people living in Alton is 38 years old.

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