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County · code 38085

Sioux CountyNorth Dakota

Sioux County is a county in North Dakota with its seat at Fort Yates, formed in 1914.

  • Founded1914
  • County seatFort Yates
  • Named forSioux
  • Land area1,094 sq mi + 34 sq mi water
  • Population3,898 2020 Census
  • Parcels mapped14,556 checked 15 October 2026
Open the free map Click any parcel in Sioux County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Corson, SDGrantMortonEmmonsAdamsPerkins, SD Fort Yates Census outline · seat marked

Where it is

Sioux on the map of North Dakota

North Dakota has 53 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyBarnes CountyBenson CountyBillings CountyBottineau CountyBowman CountyBurke CountyBurleigh CountyCass CountyCavalier CountyDickey CountyDivide CountyDunn CountyEddy CountyEmmons CountyFoster CountyGolden Valley CountyGrand Forks CountyGrant CountyGriggs CountyHettinger CountyKidder CountyLaMoure CountyLogan CountyMcHenry CountyMcIntosh CountyMcKenzie CountyMcLean CountyMercer CountyMorton CountyMountrail CountyNelson CountyOliver CountyPembina CountyPierce CountyRamsey CountyRansom CountyRenville CountyRichland CountyRolette CountySargent CountySheridan CountySlope CountyStark CountySteele CountyStutsman CountyTowner CountyTraill CountyWalsh CountyWard CountyWells CountyWilliams CountySioux County Sioux
Counties of North Dakota · Sioux highlighted

History

Founded in 1914

An old deed may name a county that no longer exists, or a boundary that has since moved.

Sioux County was created on September 3, 1914, from the Standing Rock Indian Reservation and was fully organized nine days later. The county is named after the Sioux people.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1914
    Sioux County created Sioux created from all of Non-County Area 9 by proclamation of the governor; Non-County Area 9 eliminated. Sioux not fully organized, not attached. · Hall, 248
  2. 1914
    Changed Sioux fully organized. · Hall, 249

Land and parcels

What the maps cover in Sioux

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Sioux by the Census

Population
3,898 2020 Census count
Housing units
1,277 2020 Census count
Land area
1,094 square miles
Water area
34 square miles
People per sq mi
4 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

See your own lot on these maps

Open Sioux County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Sioux County

When was Sioux County founded?
Sioux County was founded in 1914, and named after Sioux.
What is the county seat of Sioux County?
The county seat of Sioux County is Fort Yates.
Is there an online parcel map for Sioux County?
Yes. Sioux County publishes a parcel map of 14,556 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Sioux County's boundary or name changed?
Sioux County was created in 1914. Since then the Atlas of Historical County Boundaries records 1 later change.
Is my lot in a flood zone?
We do not have flood maps for Sioux County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door