City in Madison County, Illinois · 15.7 sq mi · 1,587 people per sq mi
About 25,000 people live in Alton. The typical household earns $54,568, and the median resident is 38 years old.
2026 projection
From 25,640 in 2020
Poverty rate 21.03%
Men 36.9 · Women 39
1840–2026
24,865
2026 projection
3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1840–2026
24,865
2026 projection
3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 24,865 | -148 | 0.59% |
|---|---|---|---|
| 2025 | 25,013 | -36 | 0.14% |
| 2024 | 25,049 | -84 | 0.33% |
| 2023 | 25,133 | -136 | 0.54% |
| 2022 | 25,269 | -199 | 0.78% |
| 2021 | 25,468 | -172 | 0.67% |
| 2020 | 25,640 | -622 | 2.37% |
| 2019 | 26,262 | -245 | 0.92% |
| 2018 | 26,507 | -223 | 0.83% |
| 2017 | 26,730 | -145 | 0.54% |
Showing 10 of 34 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 253 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 5 residents
34% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 34% | 36% | 32% |
| Never married | 41% | 46% | 37% |
| Divorced | 16% | 13% | 19% |
| Widowed | 7% | 3% | 10% |
| Separated | 2% | 1% | 3% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau