Wisconsin ZIP codes
Wisconsin holds 896 ZIP codes between 53001 and 54990. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Wisconsin
| Place | ZIP codes |
|---|---|
| Milwaukee | 41 |
| Madison | 35 |
| Green Bay | 12 |
| Racine | 8 |
| Appleton | 6 |
| Kenosha | 5 |
| Oshkosh | 5 |
| Janesville | 4 |
| Waukesha | 4 |
| Eau Claire | 3 |
| Fond Du Lac | 3 |
| La Crosse | 3 |
| Wausau | 3 |
| Stevens Point | 3 |
| Sheboygan | 3 |
| Brookfield | 3 |
| Marshfield | 3 |
| New Holstein | 2 |
| Chippewa Falls | 2 |
| Randolph | 2 |
Wisconsin counties by ZIP count
| County | ZIP codes |
|---|---|
| Dane | 57 |
| Milwaukee | 48 |
| Waukesha | 31 |
| Grant | 23 |
| Dodge | 22 |
| Outagamie | 20 |
| Brown | 19 |
| Kenosha | 19 |
| Marathon | 19 |
| Manitowoc | 16 |
Reading a Wisconsin ZIP code
Wisconsin holds 896 ZIP codes between 53001 and 54990, spread over 72 counties. Milwaukee leads the state with 41 codes, ahead of Madison with 35. Every code here opens with the digit 5: that opening number is the national postal region Wisconsin belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Milwaukee spreads across 41 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Wisconsin; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources