Colby, WI ZIP Codes
One ZIP code serves Colby, Wisconsin: 54421. Together they are home to 3,468 residents in 1,170 households. That is more than the 1,907 people counted inside Colby city limits, because these ZIP codes reach past its boundary.
Colby city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 1,907 |
| Households | 689 |
| Median household income | $50,114 |
| Median home value | $184,700 |
| Median age | 38.3 |
| Median rent | $854 |
All 1 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 3,468 |
| Households (sum of ZIP codes) | 1,170 |
| Median household income, range across ZIP codes | $60,820 (54421) to $60,820 (54421) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $60,820 |
| Homeowners | 68.3% |
| Households with kids under 18 | 38.6% |
| Moved in the past year | 9.7% |
| Carrier routes in EDDM2GO's route library | not loaded yet |
Every ZIP code in Colby
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 54421 | Colby | 3,468 | 1,170 | $60,820 | $194,500 | 68.3% | 38.6% | 9.7% | — | — | 2% of its land; mailing city |
A ZIP code is listed for Colby when at least 10% of its land lies inside Colby city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Colby. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Colby.
Counties
- Marathon County — 25 ZIP codes
Price a mailing to Colby ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Colby, WI?
- 54421. A ZIP code is listed for Colby when at least 10% of its land lies inside Colby city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Colby.
- What is the population of Colby, WI?
- The Census Bureau counts 1,907 residents inside Colby city limits (ACS 2020–2024). The 1 ZIP code that serve Colby hold 3,468 residents in all.
- What is the median household income in Colby, WI?
- $50,114 inside Colby city limits, per the Census Bureau. Across its ZIP codes the medians run from $60,820 to $60,820.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.