ZIP Codes of Sargent County, ND

Population & People
Population & People
Total Population
168
Household Income
Household Income
Median Income
$130,694
Housing
Housing
Total Housing Units
82
Business & Economy
Business & Economy
Total Businesses
144
Employment
Employment
Employment Rate
76.26%
Education
Education
Bachelor's Degree+
36.84%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 1 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All]
Area Codes:605 / 701
Timezone:Central (GMT -06:00)
Local Time:11:54:22 PM
Population:168 [See All]
FIPS:46091
Land Area:892 sq mi
Water Area:45 sq mi
Coordinates:45.9859, -97.5459
Quick Link:
https://www.zip-codes.com/county/nd-sargent.asp
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Among America's 50 wealthiest counties
#50 nationwide, average median income $130,694.
Among North Dakota's 5 most-educated counties
36.8% with bachelor's+ (#5 statewide).
Among North Dakota's 5 oldest counties
Median age 54.0.
Owner-dominated county
Just 10.4% of homes are rentals — strong homeownership culture.

Standout ZIPs in this County


Most Populous
Milnor · 1,149 people
29.6% of county total
Highest Income
Havana · $130,694 median
1.5× county average
Largest Land Area
Milnor · 255.1 sq mi
Spans the most ground
Fastest Growth
Milnor · -9.5% (10-yr)
1,270 → 1,149 residents
Most Educated
— no education data

Things worth knowing about Sargent County


3,883 residents live across 8 ZIPs covering 892 sq mi, served by 8 distinct USPS-recognized cities.

Population moved from 3,914 to 3,883 from 2014 to 2024 — a -0.8% change. 5 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 58043 (Havana, $130,694 median) and poorest ZIP 58017 (Cogswell, $61,250) are 16.0 miles apart — a 2.1× income gap across local geography.

Median home values vary 2.5× across this county — from $84,500 in 58017 (Cogswell) to $208,600 in 58040 (Gwinner).

Density varies across the county — from 2 people/sq mi in 58017 (Cogswell) to 12 in 58040 (Gwinner).

Educational attainment ranges from 8.0% bachelor's+ in 58017 (Cogswell) to 36.8% in 58043 (Havana) — the breadth of educational profiles across the area.

Within North Dakota, this is the #64 most populous of 64 counties and ranks #1 for median household income with the #8 fastest decade growth .

On the national stage, Sargent County is ranks #50 for income .

Weighted by population, the typical household earns about $78,406 across the county — reflecting what a typical resident sees, not a simple ZIP average.

19.1% of adults age 25+ hold a bachelor's degree or higher (544 of 2,852 reporting).

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

Stories about Sargent 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
892
square miles
Avg density
4.4
people per sq mi
Population
3,883
across 8 ZIPs
Milnor
255.1 sq mi
1,149 residents
Cogswell
190.4 sq mi
296 residents
Forman
95.4 sq mi
769 residents

All ZIP Codes in Sargent County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
58060MilnorStandard1,149$77,143255.1-9.5%
58040GwinnerStandard1,030$67,14383.06.7%
58032FormanStandard769$85,32995.44.1%
58017CogswellStandard296$61,250190.4-5.4%
58067RutlandStandard277$92,96955.613.1%
58043HavanaStandard168$130,69467.213.5%
58069StirumStandard15165.811.9%
58013CayugaStandard43$78,12579.3-56.6%

Adjacent & Nearby Counties