Every ZIP code in DeKalb County

644xx

The complete list of DeKalb County, MO ZIP codes with the city each one delivers to.
ZIP code	City
64422	Amity
64430	Clarksdale
64469	Maysville
64474	Osborn
64490	Stewartsville
64494	Union Star
64497	Weatherby

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in DeKalb County

Area codes covering DeKalb County

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

Where DeKalb County's ZIP codes sit

Each point is the reference point of one DeKalb 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 DeKalb 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.