Isabella County ZIP Codes

Isabella County is a county of Michigan.

ZIP codes: 8
Cities & towns: 6
Area codes: 1
Land area: 573 sq mi

Every ZIP code in Isabella County

488xx–493xx

The complete list of Isabella County, MI ZIP codes with the city each one delivers to.
ZIP code	City
48804	Mount Pleasant
48858	Mount Pleasant
48859	Mount Pleasant
48878	Rosebush
48883	Shepherd
48893	Weidman
48896	Winn
49310	Blanchard

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Isabella County

A further 3 places in Isabella County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Isabella County

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

989 Area code 989

Where Isabella County's ZIP codes sit

Each point is the reference point of one Isabella 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 Isabella 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.