Find the last 4 digits (ZIP+4) for an address in 54421

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ZIP Code 54421 – Colby, WI

Colby, Wisconsin · Marathon County · Central time

ZIP code54421
CityColby
StateWisconsin
CountyMarathon CountyClark County
Population3,468
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area69.89 sq mi
Center (lat, long)44.8952, -90.2887

Area codes in this area

534715

These are the area codes that most often serve ZIP 54421 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

54488 Unity · 4.6 mi54405 Abbotsford · 5 mi54425 Dorchester · 8.1 mi54422 Curtiss · 9.5 mi54479 Spencer · 10.2 mi54480 Stetsonville · 11 mi54484 Stratford · 12.1 mi54460 Owen · 12.6 mi

About ZIP 54421

ZIP code 54421 is assigned to Colby, Wisconsin. It crosses 2 counties; most of its land is in Marathon County. Its Census area covers about 69.89 square miles of land. The closest neighboring ZIP is 54488 (Unity), about 4.6 miles away.

Every address in 54421 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources