West Alton Missouri ZIP Codes
West Alton holds a single ZIP code.
Every ZIP code in West Alton
| ZIP code | County |
|---|---|
| 63386 | St. Charles 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 West Alton codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for West 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 West Alton ZIP code begins 633. Those first three digits identify the sectional center facility that processes mail for this part of Missouri. Statewide that range covers 51 ZIP codes, so West Alton accounts for 2% of it.
Every Missouri ZIP prefix and the region it covers →
Area codes covering West Alton
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground West Alton occupies.
West Alton Missouri area codes in full →
Where West Alton's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near West Alton
| City | Distance | ZIP codes |
|---|---|---|
| Florissant Missouri ZIP codes | 7.9 mi | 4 ZIP codes |
| Portage Des Sioux Missouri ZIP codes | 8.7 mi | 1 ZIP code |
| Hazelwood Missouri ZIP codes | 11 mi | 1 ZIP code |
| Bridgeton Missouri ZIP codes | 13 mi | 1 ZIP code |
| Maryland Heights Missouri ZIP codes | 18 mi | 1 ZIP code |
| Chesterfield Missouri ZIP codes | 25 mi | 3 ZIP codes |
| Cottleville Missouri ZIP codes | 26 mi | 1 ZIP code |
| Ballwin Missouri ZIP codes | 26 mi | 4 ZIP codes |
Straight-line distance between place reference points, not driving distance.