Alton, IL Demographics
Alton, IL is the 85th most populous of 1464 cities in Illinois, with 25,676 residents across 16 square miles. That is about 1,638 people per square mile.
At the 2020 census
| Population | 25,676 |
|---|---|
| Land area | 16 sq mi |
| Density | 1,638 / sq mi |
Data: 2020 Decennial Census · land area from Census TIGER/Line
How Alton, IL compares to the US
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About this page
City statistics cover the municipal boundary only, not the wider metro area.
Figures come from the 2020 census and the American Community Survey, compared against national averages.