ZIP Code 54421

54421 is one of Wisconsin's ZIP codes, delivering to addresses in Colby, Clark County.

City: Colby
County: Clark County
State: Wisconsin
Prefix: 544xx

Where this code sits

54421 is part of the 544xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Colby.

Colby Wisconsin ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 54421 delivers to without sharing its boundary.

ZIP codes nearest 54421

The ZIP codes whose reference points sit closest to 54421.
ZIP code	Distance	Delivers to
ZIP code 54405	3.7 mi	Abbotsford, WI
ZIP code 54488	6.2 mi	Unity, WI
ZIP code 54425	6.8 mi	Dorchester, WI
ZIP code 54422	7.8 mi	Curtiss, WI
ZIP code 54480	12 mi	Stetsonville, WI
ZIP code 54460	12 mi	Owen, WI
ZIP code 54479	12 mi	Spencer, WI
ZIP code 54426	15 mi	Edgar, 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 54421, plotted from its record coordinates.

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

Scope ZIP code 54421. 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.