Kendall County ZIP Codes

Kendall County is a county of Illinois.

ZIP codes: 8
Cities & towns: 8
Area codes: 4
Land area: 320 sq mi

Every ZIP code in Kendall County

605xx

The complete list of Kendall County, IL ZIP codes with the city each one delivers to.
ZIP code	City
60512	Bristol
60536	Millbrook
60537	Millington
60538	Montgomery
60541	Newark
60543	Oswego
60545	Plano
60560	Yorkville

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Kendall County

A further 1 place in Kendall County appears in the postal source without a page of its own; its codes are in the table above and each one links to its own page.

Area codes covering Kendall County

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

Where Kendall County's ZIP codes sit

Each point is the reference point of one Kendall 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 Kendall 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.