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

Wisconsin (WI) operates within the 5-digit ZIP prefix range 530xx–549xx. 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 for Wisconsin use those area codes with a 555 exchange, which is reserved for fictitious use.

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 use those names.

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. They use Wisconsin ZIP codes from public USPS data and real city names, but they do not correspond to real individuals or private residences.

Random Wisconsin Address Generator

These addresses are randomly generated for software testing. They are not real people’s details: the street number, unit and recipient name are invented, and no record is checked for deliverability.

Randomly generated Wisconsin mailing addresses for software testing, form validation and staging data. Each record pairs a real Wisconsin city with a ZIP prefix that serves it and the county that city sits in, then adds a street number, a secondary unit designator and a recipient name that are invented.

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 prefix-to-state assignment
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
State Capital	Madison	US Census Bureau
Primary Time Zone	Central Time (America/Chicago, UTC-6 / UTC-5 DST)	IANA time zone database

Wisconsin Postal Geography & Key Cities

ZIP codes and Sectional Center Facilities are derived from public USPS ZIP code data, area codes from the North American Numbering Plan, and county names from US Census Bureau records. Street numbers and recipient names are synthetic, and nothing is checked against an address-verification service.

Cities the generator draws from:

Milwaukee
Madison
Green Bay
Kenosha
Racine
Appleton

Key Counties & Administrative Jurisdictions

County boundaries determine local sales tax jurisdictions in Wisconsin:

Milwaukee County
Dane County
Waukesha County
Brown County
Racine County

Wisconsin Area Codes (WI)

Generated phone numbers use the area codes listed in the reference table above, paired with a 555 exchange so no number can reach a real line. Generate Wisconsin phone numbers.

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').

Wisconsin Address Examples in USPS Publication 28 Format

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. 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 for Wisconsin use those area codes with a 555 exchange, which is reserved for fictitious use.
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 use those names.
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. They use Wisconsin ZIP codes from public USPS data and real city names, but 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

The first three digits of a ZIP code place an address within Wisconsin. These are the prefixes assigned to the state:

531xx, 532xx, 534xx, 537xx, 543xx

Which processing facility sorts a given prefix is set by the current USPS labeling list L005 and changes as processing is consolidated, so it is not reproduced here. Look up a ZIP prefix to see its state and generate ZIP codes inside it.