ZIP Codes of Mahnomen County, MN

Population & People
Population & People
Total Population
4,390
Household Income
Household Income
Median Income
$63,078
Housing
Housing
Total Housing Units
2,047
Business & Economy
Business & Economy
Total Businesses
79
Employment
Employment
Employment Rate
54.21%
Education
Education
Bachelor's Degree+
17.29%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 4 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:4 ZIP Codes (4 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:218
Timezone:Central (GMT -06:00)
Local Time:2:12:37 PM
Population:4,390 [See All]
FIPS:27087
Land Area:418 sq mi
Water Area:15 sq mi
Coordinates:47.3589, -95.7763
Quick Link:
https://www.zip-codes.com/county/mn-mahnomen.asp
Need Mahnomen data in your app? Look up ZIP, county, and city data with a single API call.
Try Free
Minnesota's #82 most populous county
4,390 residents across 4 ZIPs — #82 of 93 Minnesota counties.

Standout ZIPs in this County


Most Populous
Mahnomen · 2,758 people
62.8% of county total
Highest Income
Lengby · $80,750 median
1.3× county average
Largest Land Area
Mahnomen · 233.3 sq mi
Spans the most ground
Fastest Growth
Mahnomen · -0.4% (10-yr)
2,770 → 2,758 residents
Most Educated
Mahnomen · 14.7% bachelor's+
252 of 1,710 adults 25+

Things worth knowing about Mahnomen County


4,390 residents live across 4 ZIPs covering 418 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 4,067 to 4,390 from 2014 to 2024 — a +7.9% change. 3 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 56651 (Lengby, $80,750 median) and poorest ZIP 56566 (Naytahwaush, $44,583) are 13.3 miles apart — a 1.8× income gap across local geography.

Median home values vary 1.6× across this county — from $118,300 in 56566 (Naytahwaush) to $190,800 in 56651 (Lengby).

Density varies across the county — from 4 people/sq mi in 56516 (Bejou) to 28 in 56566 (Naytahwaush).

Educational attainment ranges from 11.6% bachelor's+ in 56566 (Naytahwaush) to 29.7% in 56651 (Lengby) — the breadth of educational profiles across the area.

Within Minnesota, this is the #82 most populous of 93 counties and ranks #88 for median household income with the #17 fastest decade growth .

Weighted by population, the typical household earns about $60,316 across the county — reflecting what a typical resident sees, not a simple ZIP average.

17.3% of adults age 25+ hold a bachelor's degree or higher (461 of 2,667 reporting).

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

Stories about Mahnomen County


Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Mahnomen

All ZIP Codes in Mahnomen County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
56557MahnomenStandard2,758$57,731233.3-0.4%
56651LengbyStandard667$80,75076.029.0%
56566NaytahwaushStandard613$44,58321.915.0%
56516BejouStandard352$69,25087.142.5%

Adjacent & Nearby Counties