Wisconsin ZIP Codes: Ranges, Prefixes and Major Cities
Whether you are building an address form, cleaning a mailing list or testing shipping rules, it helps to know how ZIP codes work in Wisconsin. The state has 879 active codes spread across 72 counties.
ZIP code range and prefixes
Every Wisconsin ZIP code starts with one of 18 three-digit prefixes. Each prefix points to a sectional center facility, the processing plant that sorts mail for a group of nearby post offices.
- 530
- 531
- 532
- 534
- 535
- 537
- 538
- 539
- 540
- 541
- 542
- 543
- 544
- 545
- 546
- 547
- 548
- 549
Types of ZIP codes in Wisconsin
| Type | Count | What it covers |
|---|---|---|
| Standard | 721 | Street delivery areas |
| PO Box | 125 | Post office boxes only |
| Unique | 33 | A single high-volume organization |
ZIP codes for major Wisconsin cities
| City | County | Standard ZIPs | Range |
|---|---|---|---|
| Milwaukee | Milwaukee County | 28 | 53202–53233 |
| Madison | Dane County | 13 | 53703–53726 |
| Green Bay | Brown County | 6 | 54301–54313 |
| Racine | Racine County | 5 | 53402–53406 |
| Appleton | Outagamie County | 4 | 54911–54915 |
| Kenosha | Kenosha County | 4 | 53140–53144 |
| Janesville | Rock County | 3 | 53545–53548 |
| Oshkosh | Winnebago County | 3 | 54901–54904 |
| Waukesha | Waukesha County | 3 | 53186–53189 |
| Brookfield | Waukesha County | 2 | 53005–53045 |
| Eau Claire | Eau Claire County | 2 | 54701–54703 |
| Fond Du Lac | Fond du Lac County | 2 | 54935–54937 |
| La Crosse | La Crosse County | 2 | 54601–54603 |
| Marshfield | Wood County | 2 | 54404–54449 |
| Mequon | Ozaukee County | 2 | 53092–53097 |
Madison is the state capital. Larger cities have many ZIP codes because each code follows mail delivery routes, not city limits.
Sample addresses
Priya Clark
8105 Hill Way
Fond Du Lac, WI 54935
Jessica Jones
6580 River Pl
Eau Claire, WI 54703
James Green
999 Lake Ct
Janesville, WI 53545
These examples use real city and ZIP pairs with invented street lines, so they are safe for testing and documentation.
Tips for working with these ZIP codes
- Store ZIP codes as text, not numbers, so the format stays consistent across states with leading zeros.
- All of Wisconsin is in the Central time zone, which keeps scheduling logic simple.
- A quick sanity check: a valid WI ZIP code begins with one of the prefixes listed above.
- City names in addresses are post office names. A suburb may share a ZIP code and city name with a nearby larger town.
Create realistic Wisconsin addresses for testing, with real cities, counties and ZIP codes.
Generate Wisconsin addresses