County ZIP codes · Wisconsin · FIPS 55011
Buffalo County, WI ZIP Codes
Buffalo County, Wisconsin has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 9 residential and 1 for PO boxes or a single organization. 5 of the residential ones lie mainly in Buffalo County and 4 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $61,563 in 54610 (Alma) to $95,179 in 54738 (Eleva) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Buffalo County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $70,820 and $77,647.
They carry 9 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 9 residential ZIP codes in Buffalo County
5 ZIP codes lie mainly in Buffalo County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 54755 | Mondovi | 7,389 | 28 | $73k | $237k | 60% |
| 54629 | Fountain City | 2,595 | 23 | $74k | $230k | 100% |
| 54622 | Cochrane | 2,147 | 38 | $78k | $188k | 100% |
| 54610 | Alma | 1,564 | 12 | $62k | $207k | 100% |
| 54756 | Nelson | 946 | 12 | $76k | $215k | 100% |
Partly in Buffalo County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
5 ZIP codes of Buffalo County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Buffalo | Elsewhere |
|---|---|---|
| 54755 | 60% | Dunn County 14%; Pepin County 13%; Eau Claire County 12% |
| 54612 | 28% | Trempealeau County 72% |
| 54736 | 45% | Pepin County 50%; Dunn County 5% |
| 54738 | 1% | Eau Claire County 54%; Trempealeau County 45% |
| 54747 | 37% | Trempealeau County 63% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 54743 | Gilmanton |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Buffalo County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Buffalo County's ZIP codes use 2 prefixes: 546 and 547.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.