ZIP Codes of Iron County, WI

Population & People
Population & People
Total Population
6,057
Household Income
Household Income
Median Income
$60,238
Housing
Housing
Total Housing Units
4,985
Business & Economy
Business & Economy
Total Businesses
185
Employment
Employment
Employment Rate
54.00%
Education
Education
Bachelor's Degree+
24.24%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 7 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:7 ZIP Codes (6 Standard, 1 PO Box, 0 Unique) [See All]
Area Code:715
Timezone:Central (GMT -06:00)
Local Time:2:14:19 PM
Population:6,057 [See All]
FIPS:55051
Land Area:607 sq mi
Water Area:29 sq mi
Coordinates:46.3594, -90.2984
Quick Link:
https://www.zip-codes.com/county/wi-iron.asp
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Extreme geographic sprawl
The largest ZIP spans 222× the smallest by area — 177.6 sq mi down to 0.80.
Owner-dominated county
Just 14.4% of homes are rentals — strong homeownership culture.

Standout ZIPs in this County


Most Populous
Hurley · 2,393 people
39.5% of county total
Highest Income
Gile · $74,375 median
1.2× county average
Largest Land Area
Mercer · 177.6 sq mi
Spans the most ground
Fastest Growth
Mercer · 20.7% (10-yr)
1,283 → 1,549 residents
Most Educated
Mercer · 36.6% bachelor's+
478 of 1,305 adults 25+

Things worth knowing about Iron County


6,057 residents live across 7 ZIPs covering 607 sq mi, served by 7 distinct USPS-recognized cities.

Population moved from 5,703 to 6,057 from 2014 to 2024 — a +6.2% change. 5 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 54525 (Gile, $74,375 median) and poorest ZIP 54534 (Hurley, $53,468) are 7.6 miles apart — a 1.4× income gap across local geography.

Median home values vary 4.6× across this county — from $66,800 in 54536 (Iron Belt) to $306,600 in 54547 (Mercer).

Density varies 62× across the county — from 6 people/sq mi in 54559 (Saxon) to 398 in 54525 (Gile).

Educational attainment ranges from 9.5% bachelor's+ in 54536 (Iron Belt) to 36.6% in 54547 (Mercer) — the breadth of educational profiles across the area.

Within Wisconsin, this is the #70 most populous of 73 counties and ranks #67 for median household income with the #15 fastest decade growth .

Weighted by population, the typical household earns about $60,800 across the county — reflecting what a typical resident sees, not a simple ZIP average.

24.2% of adults age 25+ hold a bachelor's degree or higher (1,157 of 4,774 reporting).

6 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Iron County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
607
square miles
Avg density
10.0
people per sq mi
Population
6,057
across 7 ZIPs
Mercer
177.6 sq mi
1,549 residents
Hurley
168.0 sq mi
2,393 residents
Saxon
129.7 sq mi
837 residents

All ZIP Codes in Iron County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
54534HurleyStandard2,393$53,468168.01.4%
54547MercerStandard1,549$63,500177.620.7%
54559SaxonStandard837$69,696129.70.5%
54550MontrealStandard768$64,58335.121.3%
54525GileStandard318$74,3750.818.7%
54536Iron BeltPO Box154$57,91711.7-30.0%
54565UpsonStandard38$38,12584.3-64.2%

Adjacent & Nearby Counties