North Dakota · FIPS 38085 · County seat: Fort Yates
Sioux County, ND GIS & Parcel Viewer
Here is the direct link to the county parcel map covering Sioux County, ND: the Sioux County ArcGIS parcel map. Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the Sioux County parcel map ↗
Opens portico.sidwellco.com in a new tab. We link out and never embed or copy parcel data.
Sioux County at a glance
| Official map | Sioux County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | portico.sidwellco.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Fort Yates |
| Population | 3,643 (2023 Census Bureau estimate) |
| Land area | 1,094 sq mi |
| FIPS code | 38085 |
Where the parcel data comes from
It is a county-level map: Sioux County or the company it hires keeps the parcel layer up to date. Our October 2026 check found the map open to the public, with no account or payment needed.
Finding a property on this map
- Open the link. This viewer is an ArcGIS Experience Builder app, so its layout is custom to the publisher.
- Look for a search box or search widget and type in a street address or parcel ID.
- Click a parcel to see its details in a pop-up or side panel.
- Check the toolbar for a layer list or basemap switcher if you want aerials or other layers.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
About Sioux County
The U.S. Census Bureau estimated Sioux County's population at 3,643 in 2023, spread over about 1,094 square miles of land, or roughly 3.3 people per square mile. By population it ranks 30th of 53 counties in North Dakota. Its county seat is Fort Yates.
Neighboring counties
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Sioux County:
Before you rely on the lines
The lines you see online are approximate. They're good for finding a lot and its parcel number, but a legal boundary question needs the recorded plat or a surveyor.