Grundy County ZIP Codes

Grundy County is a county of Illinois.

ZIP codes: 9
Cities & towns: 9
Area codes: 2
Land area: 418 sq mi

Every ZIP code in Grundy County

604xx

The complete list of Grundy County, IL ZIP codes with the city each one delivers to.
ZIP code	City
60407	Braceville
60416	Coal City
60424	Gardner
60437	Kinsman
60444	Mazon
60447	Minooka
60450	Morris
60474	South Wilmington
60479	Verona

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Grundy County

Area codes covering Grundy County

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

Where Grundy County's ZIP codes sit

Each point is the reference point of one Grundy 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 Grundy 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.