ZIP Code 54423

54423 is one of Wisconsin's ZIP codes, delivering to addresses in Custer, Portage County.

City: Custer
County: Portage County
State: Wisconsin
Prefix: 544xx

Where this code sits

54423 is part of the 544xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Custer.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 54423 delivers to without sharing its boundary.

ZIP codes nearest 54423

The ZIP codes whose reference points sit closest to 54423.
ZIP code	Distance	Delivers to
ZIP code 54482	5.1 mi	Stevens Point, WI
ZIP code 54492	6.8 mi	Stevens Point, WI
ZIP code 54407	6.9 mi	Amherst Junction, WI
ZIP code 54458	7.2 mi	Nelsonville, WI
ZIP code 54473	7.7 mi	Rosholt, WI
ZIP code 54481	7.7 mi	Stevens Point, WI
ZIP code 54467	10 mi	Plover, WI
ZIP code 54406	11 mi	Amherst, WI

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 54423, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 54423. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.