In which county is ZIP code 54423 located?

ZIP 54423 is listed under Portage County, WI.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 54423: Custer, WI

ZIP: 54423

County: Portage County

Coordinates: 44.56620, -89.41530

ZIP Type: Standard

Time Zone: Central Time (CT)

This profile provides an in-depth look at ZIP code 54423, serving Custer in WI. It lies in Portage County and supports delivery, planning, and address verification.

Primary City	Custer
ZIP Code	54423
County	Portage County
State	WI
Latitude / Longitude	44.56620, -89.41530
ZIP Type	Standard
Time Zone	Central Time (CT)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 54423 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 54423 is approximately 44.56620 (latitude) and -89.41530 (longitude). This location sits within Portage County, contributing to regional planning across WI.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 54423 for mail delivery and general location reference in Portage County, WI.

This ZIP may extend beyond the city core into nearby communities within Portage County.

Related ZIP Codes (Nearby)

Explore other postal codes near Custer within WI.

Frequently Asked Questions

What is the primary city for ZIP code 54423?

The primary city for this ZIP code is Custer, located in WI.

In which county is 54423 located?

ZIP code 54423 is situated within Portage County, WI.

What are the coordinates for 54423?

The approximate center point is 44.56620 (Latitude) and -89.41530 (Longitude).

Is ZIP code 54423 active?

This page lists ZIP 54423 as Listed based on the latest refresh date shown above.

Does ZIP 54423 cover multiple areas?

Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.

Methodology & Data Notes

How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.

Page updated: 2026-01-08