ZIP Codes of Sioux County, ND

Population & People
Population & People
Total Population
544
Household Income
Household Income
Median Income
$58,636
Housing
Housing
Total Housing Units
207
Business & Economy
Business & Economy
Total Businesses
0
Employment
Employment
Employment Rate
62.34%
Education
Education
Bachelor's Degree+
21.92%
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:4 ZIP Codes (4 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:605
Timezone:Mountain (GMT -07:00)
Local Time:11:54:22 PM
Population:544 [See All]
FIPS:46031
Land Area:1,044 sq mi
Water Area:13 sq mi
Coordinates:46.1143, -101.0627
Quick Link:
https://www.zip-codes.com/county/nd-sioux.asp
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Notable income spread
Median income ranges $33,333 to $110,938 across ZIPs — a 3.3× gap.

Standout ZIPs in this County


Most Populous
Fort Yates · 2,171 people
56.7% of county total
Highest Income
Solen · $110,938 median
1.9× county average
Largest Land Area
Selfridge · 395.0 sq mi
Spans the most ground
Fastest Growth
Fort Yates · -18.5% (10-yr)
2,665 → 2,171 residents
Most Educated
Fort Yates · 19.8% bachelor's+
209 of 1,055 adults 25+

Things worth knowing about Sioux County


3,829 residents live across 4 ZIPs covering 1,044 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 4,487 to 3,829 from 2014 to 2024 — a -14.7% change. 2 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 58570 (Solen, $110,938 median) and poorest ZIP 58528 (Cannon Ball, $33,333) are 12.2 miles apart — a 3.3× income gap across local geography.

Median home values vary 1.5× across this county — from $81,000 in 58568 (Selfridge) to $120,100 in 58570 (Solen).

Density varies across the county — from 1 people/sq mi in 58570 (Solen) to 9 in 58528 (Cannon Ball).

Educational attainment ranges from 3.3% bachelor's+ in 58528 (Cannon Ball) to 26.6% in 58570 (Solen) — the breadth of educational profiles across the area.

Within North Dakota, this is the #58 most populous of 64 counties and ranks #60 for median household income .

Weighted by population, the typical household earns about $46,650 across the county — reflecting what a typical resident sees, not a simple ZIP average.

18.0% of adults age 25+ hold a bachelor's degree or higher (360 of 1,999 reporting).

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

Stories about Sioux County


Two counties in one

Median household income spans 3.3× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.

Wealthiest ZIP
Solen
Median income: $110,938
Population: 437
Bachelor's+: 26.6%
vs
Poorest ZIP (pop >= 500)
Cannon Ball
Median income: $33,333
Population: 677
Bachelor's+: 3.3%
For every $1 of household income in 58528, the typical household in 58570 earns $3.33.

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
1,044
square miles
Avg density
3.7
people per sq mi
Population
3,829
across 4 ZIPs
Selfridge
395.0 sq mi
544 residents
Solen
344.1 sq mi
437 residents
Fort Yates
232.6 sq mi
2,171 residents

All ZIP Codes in Sioux County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
58538Fort YatesStandard2,171$34,858232.6-18.5%
58528Cannon BallStandard677$33,33372.0-20.5%
58568SelfridgeStandard544$58,636395.00.7%
58570SolenStandard437$110,938344.11.6%

Adjacent & Nearby Counties