Colby, WI ZIP code
The ZIP code for Colby, Wisconsin is 54421. It is in Marathon County.
- Population in these ZIPs
- 3,468
- Avg. median income
- $60,800population-weighted
- Typical home value
- $222,900population-weighted
- Metro area
- Wausau, WI
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Colby, WI ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 54421 | 3,468 | $60,820 | $222,900 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Colby
- Unity 5 mi
- Abbotsford 5 mi
- Dorchester 8 mi
- Curtiss 10 mi
- Spencer 10 mi
- Stetsonville 11 mi
- Stratford 12 mi
- Owen 13 mi
- Loyal 13 mi
- Edgar 14 mi
- Athens 17 mi
- Marshfield 17 mi
Frequently asked questions
What is the ZIP code for Colby, WI?
The ZIP code for Colby, WI is 54421.
What county is Colby, Wisconsin in?
Colby ZIP codes are in Marathon County.