County ZIP codes · Wisconsin · FIPS 55051
Iron County, WI ZIP Codes
Iron County, Wisconsin has 11 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Iron County and 4 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $51,429 in 54538 (Lac Du Flambeau) to $74,432 in 54557 (Presque Isle) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Iron 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 $53,468 and $63,500.
They carry 11 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 11 residential ZIP codes in Iron County
7 ZIP codes lie mainly in Iron County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 54534 | Hurley | 2,393 | 18 | $54k | $124k | 100% |
| 54547 | Mercer | 1,549 | 7 | $64k | $307k | 100% |
| 54559 | Saxon | 837 | 7 | $70k | $159k | 85% |
| 54550 | Montreal | 768 | 28 | $65k | $112k | 100% |
| 54525 | Gile | 318 | 340 | $74k | $81k | 100% |
| 54536 | Iron Belt | 154 | 4 | $58k | $67k | 100% |
| 54565 | Upson | 38 | 0 | $38k | $171k | 100% |
Partly in Iron 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 Iron County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Iron | Elsewhere |
|---|---|---|
| 54552 | 26% | Price County71%; Sawyer County3% |
| 54538 | 12% | Vilas County77%; Oneida County10% |
| 54514 | 6% | Ashland County81%; Price County13% |
| 54557 | 1% | Vilas County99% |
| 54559 | 85% | Ashland County15% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Iron County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Iron County starts with 545.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 545 | Green Bay, WI (SCF 541) | 11 | 47 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.