Alton town-wide reference facts
2020 Census counts and 2025 geography. Whole-town figures only.
- Population, 2020 Census
- 25,676
- Housing units, 2020 Census
- 12,995
- Land area, 2025 geography
- 15.67 sq mi
- Water area, 2025 geography
- 1.28 sq mi
- Census place type
- city
- Census place GEOID
- 1701114
