Alton Illinois ZIP Codes
Alton holds a single ZIP code.
Every ZIP code in Alton
| ZIP code | County |
|---|---|
| 62002 | Madison County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Alton codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Alton. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Alton ZIP code begins 620. Those first three digits identify the sectional center facility that processes mail for this part of Illinois. Statewide that range covers 78 ZIP codes, so Alton accounts for 1% of it.
Every Illinois ZIP prefix and the region it covers →
Area codes covering Alton
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Alton occupies.
Alton Illinois area codes in full →
Where Alton's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Alton
| City | Distance | ZIP codes |
|---|---|---|
| East Alton Illinois ZIP codes | 2.7 mi | 1 ZIP code |
| Wood River Illinois ZIP codes | 4.9 mi | 1 ZIP code |
| Godfrey Illinois ZIP codes | 5.1 mi | 1 ZIP code |
| Bethalto Illinois ZIP codes | 5.7 mi | 1 ZIP code |
| Hartford Illinois ZIP codes | 7.0 mi | 1 ZIP code |
| Roxana Illinois ZIP codes | 8.0 mi | 1 ZIP code |
| South Roxana Illinois ZIP codes | 8.1 mi | 1 ZIP code |
| Brighton Illinois ZIP codes | 9.5 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.