Alton, IL ZIP code
The ZIP code for Alton, Illinois is 62002. It is in Madison County.
- Population in these ZIPs
- 29,543
- Avg. median income
- $61,400population-weighted
- Typical home value
- $117,400population-weighted
- Metro area
- St. Louis, MO-IL
Loading map…
Click anywhere on the map to see which ZIP code it's in.
Alton, IL ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 62002 | 29,543 | $61,414 | $117,400 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Alton
- Cottage Hills 3 mi
- East Alton 5 mi
- Bethalto 5 mi
- Godfrey 6 mi
- Wood River 6 mi
- Brighton 7 mi
- Roxana 8 mi
- Moro 8 mi
- Dorsey 9 mi
- South Roxana 9 mi
- Dow 11 mi
- Hartford 11 mi
Frequently asked questions
What is the ZIP code for Alton, IL?
The ZIP code for Alton, IL is 62002.
What county is Alton, Illinois in?
Alton ZIP codes are in Madison County.