What ZIP codes does Wisconsin use for mail and package delivery?

Wisconsin (WI) operates within the 5-digit ZIP prefix range 530xx–549xx, covering numeric postal codes from 53001 – 54990. Mail routed to state capital Madison and key regional centers such as Milwaukee, Madison, Green Bay adheres to these official USPS boundaries.

Which telephone area codes are valid for Wisconsin?

Wisconsin is served by 7 active North American Numbering Plan (NANPA) area codes: 262, 274, 414, 534, 608, 715, 920. Synthetic telephone numbers generated for Wisconsin reflect these verified regional area code assignments across state jurisdictions.

How many counties are in Wisconsin?

Wisconsin is divided into 72 counties, including major administrative regions such as Milwaukee, Dane, Waukesha, Brown. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.

What postal formatting conventions and addressing quirks are unique to Wisconsin?

Grid coordinate rural fire numbering system (e.g., 'W1234 N5678 County Rd A') widespread across eastern and southeastern Wisconsin counties. Distinctive dual-letter and single-letter county trunk highway designations (e.g., 'County Hwy BB', 'County Rd K'). All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.

Are the Wisconsin addresses generated on this page real places?

No. All street numbers, recipient names, and telephone numbers generated for Wisconsin are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Wisconsin ZIP codes (530xx–549xx), real city names (Milwaukee, Madison), and verified area codes (262, 274), they do not correspond to real individuals or private residences.

Random Wisconsin Address Generator

Wisconsin ZIP codes span the 530xx–549xx range (53001 – 54990) across 72 counties with 7 active telephone area codes (262, 274, 414, 534, etc.).

Generate a realistic, USPS Publication 28-compliant random Wisconsin address with authentic postal routing, real ZIP codes, and local area codes. Featuring verified ZIP prefix coverage across 530xx–549xx, realistic street grids from Milwaukee and Madison, official area codes (262, 274, 414, 534), and accurate county assignments. Engineered specifically for QA automation, form validation, and software testing.

Official Wisconsin Postal & Geographic Reference Specifications

Geographic & Postal Parameter	Official State Specification	Standardization Reference
Postal State Abbreviation	WI	USPS Publication 28 & ISO 3166-2:US
5-Digit ZIP Prefix Range	530xx–549xx	USPS Sectional Center Facilities (SCFs)
5-Digit ZIP Numeric Span	`53001 – 54990`	Lowest to highest active postal delivery codes
Administrative Jurisdictions	72 Total Counties	US Census Bureau regional boundaries
Active Area Codes (NANPA)	`262, 274, 414, 534, 608, 715, 920` (7 total)	North American Numbering Plan Administrator
Capital & Distribution Centers	Madison (Capital), Milwaukee, Madison, Green Bay	Primary municipal carrier distribution hubs
Primary Time Zone	Central Time (America/Chicago, UTC-6 / UTC-5 DST)	Regional postal dispatch & timestamp alignment
Authoritative Validation Source	Public Service Commission of Wisconsin & NANPA	Official state regulatory authority

Wisconsin Postal Geography & Key Cities

State Capital: Madison | Postal Code: WI | Total Counties: 72 Counties | ZIP Prefix Range: 530xx–549xx

Verified Data Authority: Public Service Commission of Wisconsin & NANPA

Major municipal distribution centers:

Milwaukee
Madison
Green Bay
Kenosha
Racine
Appleton

Key Counties & Administrative Jurisdictions

County boundaries dictate local sales tax jurisdictions and carrier route groupings across Wisconsin:

Milwaukee County
Dane County
Waukesha County
Brown County
Racine County

Real Wisconsin Area Codes (WI)

7 active numbering plan area (NPA) codes serving 72 jurisdictions across Wisconsin.

Active North American Numbering Plan area codes: 262, 274, 414, 534, 608, 715, 920

Postal Delivery Standards & Format Nuances in Wisconsin

Grid coordinate rural fire numbering system (e.g., 'W1234 N5678 County Rd A') widespread across eastern and southeastern Wisconsin counties.
Distinctive dual-letter and single-letter county trunk highway designations (e.g., 'County Hwy BB', 'County Rd K').

Standard USPS Publication 28 Test Examples for Wisconsin

Residential Delivery Point:
100 Main St, Apt 4B Milwaukee, WI 53202-1204

Commercial / Multi-Unit Delivery Point:
Wisconsin Logistics & Software Corp 500 Enterprise Way, Suite 300 Madison, WI 53703-4810

Frequently Asked Questions about Wisconsin Addresses

What ZIP codes does Wisconsin use for mail and package delivery?: Wisconsin (WI) operates within the 5-digit ZIP prefix range 530xx–549xx, covering numeric postal codes from 53001 – 54990. Mail routed to state capital Madison and key regional centers such as Milwaukee, Madison, Green Bay adheres to these official USPS boundaries.
Which telephone area codes are valid for Wisconsin?: Wisconsin is served by 7 active North American Numbering Plan (NANPA) area codes: 262, 274, 414, 534, 608, 715, 920. Synthetic telephone numbers generated for Wisconsin reflect these verified regional area code assignments across state jurisdictions.
How many counties are in Wisconsin?: Wisconsin is divided into 72 counties, including major administrative regions such as Milwaukee, Dane, Waukesha, Brown. Generated street addresses reflect these authentic jurisdictional subdivisions and their corresponding postal distribution points.
What postal formatting conventions and addressing quirks are unique to Wisconsin?: Grid coordinate rural fire numbering system (e.g., 'W1234 N5678 County Rd A') widespread across eastern and southeastern Wisconsin counties. Distinctive dual-letter and single-letter county trunk highway designations (e.g., 'County Hwy BB', 'County Rd K'). All addresses generated on this platform format secondary unit designators (Apt, Ste, Fl) and street suffixes according to USPS CASS standards.
Are the Wisconsin addresses generated on this page real places?: No. All street numbers, recipient names, and telephone numbers generated for Wisconsin are entirely synthetic and randomized for software testing, database seed scripts, and form validation. While they use authentic Wisconsin ZIP codes (530xx–549xx), real city names (Milwaukee, Madison), and verified area codes (262, 274), they do not correspond to real individuals or private residences.

Nearby & Bordering States

Explore test address generators for states sharing a geographic border with WI:

Wisconsin ZIP Prefixes and Sectional Center Facilities

Mail addressed to Wisconsin is sorted through the processing facilities below before local delivery. The first three digits of a ZIP code identify which one, so the prefix alone places an address within the state.

ZIP prefix	Sectional Center Facility	County
531xx	Kenosha / Racine South	Kenosha County
532xx	Milwaukee	Milwaukee County
534xx	Racine	Racine County
537xx	Madison	Dane County
543xx	Green Bay	Brown County

These 5 prefixes cover the 530xx–549xx range. Look up any ZIP prefix to see its facility and generate valid ZIP codes inside it.