Colby, WI zip code
Colby, Wisconsin uses one zip code: 54421. Most of it is in Marathon County. Together these zip codes are home to about 3.5K people.
Zip codes
1
Population
3.5K
All zips combined
Largest zip
54421
3,468 residents
Zip codes in Colby
| Zip | Type | Population | IncomeMedian income |
|---|---|---|---|
| 54421 | 3,468 | $60,820 |