County ZIP codes · Wisconsin · FIPS 55081
Monroe County, WI ZIP Codes
Monroe County, Wisconsin has 15 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 12 residential and 3 for PO boxes or a single organization. 7 of the residential ones lie mainly in Monroe County and 5 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $60,417 in 54638 (Kendall) to $82,250 in 54670 (Wilton) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Monroe 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 $62,159 and $73,214.
They carry 12 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 12 residential ZIP codes in Monroe County
7 ZIP codes lie mainly in Monroe County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 54656 | Sparta | 18,160 | 64 | $72k | $214k | 100% |
| 54660 | Tomah | 16,124 | 93 | $61k | $197k | 100% |
| 54619 | Cashton | 3,849 | 37 | $72k | $230k | 74% |
| 54666 | Warrens | 2,635 | 11 | $78k | $221k | 45% |
| 54670 | Wilton | 2,048 | 39 | $82k | $229k | 100% |
| 54648 | Norwalk | 1,608 | 22 | $74k | $168k | 100% |
| 54638 | Kendall | 1,513 | 25 | $60k | $283k | 84% |
Partly in Monroe County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 54651 | Ontario | 1,384 | 23 | $62k | $173k | 43% |
| 54653 | Rockland | 1,335 | 62 | $73k | $264k | 39% |
| 54618 | Camp Douglas | 2,333 | 25 | $73k | $169k | 30% |
| 53929 | Elroy | 2,808 | 38 | $66k | $187k | 17% |
| 54615 | Black River Falls | 11,315 | 36 | $67k | $198k | 3% |
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?
8 ZIP codes of Monroe County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Monroe | Elsewhere |
|---|---|---|
| 54615 | 3% | Jackson County 97% |
| 54619 | 74% | Vernon County 22%; La Crosse County 4% |
| 53929 | 17% | Juneau County 72%; Vernon County 11% |
| 54666 | 45% | Jackson County 44%; Juneau County 11% |
| 54618 | 30% | Juneau County 70% |
| 54638 | 84% | Vernon County 13%; Juneau County 3% |
| 54651 | 43% | Vernon County 57% |
| 54653 | 39% | La Crosse County 61% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 54620 | Cataract |
| 54649 | Oakdale |
| 54662 | Tunnel City |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Monroe County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Monroe County's ZIP codes use 2 prefixes: 539 and 546.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.