Every ZIP code in St. Clair County

647xx

The complete list of St. Clair County, MO ZIP codes with the city each one delivers to.
ZIP code	City
64724	Appleton City
64738	Collins
64763	Lowry City
64776	Osceola
64781	Roscoe

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 St. Clair County codes above are listed without a column we would have to invent.

Cities and towns in St. Clair County

Area codes covering St. Clair County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where St. Clair County's ZIP codes sit

Each point is the reference point of one St. Clair County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope every ZIP code recorded in St. Clair County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.