ZIP Codes of Iron County, MI

Population & People
Population & People
Total Population
11,610
Household Income
Household Income
Median Income
$47,379
Housing
Housing
Total Housing Units
9,023
Business & Economy
Business & Economy
Total Businesses
357
Employment
Employment
Employment Rate
45.49%
Education
Education
Bachelor's Degree+
22.43%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 7 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:7 ZIP Codes (3 Standard, 4 PO Box, 0 Unique) [See All]
Area Code:906
Timezone:Central (GMT -06:00)
Local Time:11:53:50 PM
Population:11,610 [See All]
FIPS:26071
Land Area:1,039 sq mi
Water Area:42 sq mi
Coordinates:46.1296, -88.5249
Quick Link:
https://www.zip-codes.com/county/mi-iron.asp
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Michigan's #72 most populous county
11,610 residents across 7 ZIPs — #72 of 83 Michigan counties.

Standout ZIPs in this County


Most Populous
Iron River · 5,841 people
50.3% of county total
Highest Income
Crystal Falls · $63,605 median
1.3× county average
Largest Land Area
Crystal Falls · 503.8 sq mi
Spans the most ground
Fastest Growth
Crystal Falls · 2.1% (10-yr)
4,292 → 4,380 residents
Most Educated
Crystal Falls · 23.8% bachelor's+
825 of 3,472 adults 25+

Things worth knowing about Iron County


11,610 residents live across 7 ZIPs covering 1,039 sq mi, served by 7 distinct USPS-recognized cities.

Population moved from 11,569 to 11,610 from 2014 to 2024 — a +0.4% change. 4 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 49920 (Crystal Falls, $63,605 median) and poorest ZIP 49915 (Caspian, $35,000) are 17.3 miles apart — a 1.8× income gap across local geography.

Median home values vary 3.8× across this county — from $34,100 in 49902 (Alpha) to $129,500 in 49920 (Crystal Falls).

Density varies 100× across the county — from 4 people/sq mi in 49903 (Amasa) to 440 in 49915 (Caspian).

Educational attainment ranges from 8.1% bachelor's+ in 49902 (Alpha) to 23.8% in 49920 (Crystal Falls) — the breadth of educational profiles across the area.

Within Michigan, this is the #72 most populous of 83 counties and ranks #83 for median household income .

Weighted by population, the typical household earns about $57,591 across the county — reflecting what a typical resident sees, not a simple ZIP average.

22.4% of adults age 25+ hold a bachelor's degree or higher (2,008 of 8,952 reporting).

3 Standard delivery, 4 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
1,039
square miles
Avg density
11.2
people per sq mi
Population
11,610
across 7 ZIPs
Crystal Falls
503.8 sq mi
4,380 residents
Iron River
466.7 sq mi
5,841 residents
Amasa
53.1 sq mi
233 residents

All ZIP Codes in Iron County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
49935Iron RiverStandard5,841$57,236466.7-3.4%
49920Crystal FallsStandard4,380$63,605503.82.1%
49915CaspianPO Box570$35,0001.35.2%
49927GaastraStandard371$47,50013.4-12.3%
49903AmasaPO Box233$41,81853.129.4%
49902AlphaPO Box215$39,1150.7159.0%
49964StambaughPO Box0.0

Adjacent & Nearby Counties