Wisconsin ZIP Codes

ZIP codes: 896
Cities & towns: 753
Counties: 72
Area codes: 8

How Wisconsin ZIP codes are numbered

530xx–549xx

The first three digits identify the sectional center facility that processes mail for a region, so a Wisconsin ZIP code can be placed geographically from its prefix alone. Each row names the city holding the most codes in that prefix.

Wisconsin three-digit ZIP prefixes, the codes in each, and the city that holds the most of them.
Prefix	ZIP codes	Main area
530xx	83	Brookfield
531xx	66	Kenosha
532xx	42	Milwaukee
534xx	8	Racine
535xx	87	Janesville
537xx	35	Madison
538xx	22	Bagley
539xx	51	Randolph
540xx	25	Amery
541xx	56	Abrams
542xx	30	Manitowoc
543xx	12	Green Bay
544xx	86	Marshfield
545xx	47	Argonne
546xx	59	La Crosse
547xx	55	Eau Claire
548xx	66	Almena
549xx	66	Appleton

Where Wisconsin's communities sit

Each point is a Wisconsin community with a published ZIP code list, 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

Wisconsin cities by ZIP code count

largest 25

Area codes serving Wisconsin

Scope every ZIP code recorded in Wisconsin. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. The map outline is a convex envelope of published places, not a state boundary.