County Maps US

Cass County, North Dakota

The most populous of North Dakota's 53 counties.

CountyFIPS 38017

Within North Dakota
Cass County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Fargo, the county seat, located via the 2025 Census Gazetteer.

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Population
201,794
+16,897 (+9.1%) since 2020
Land area
1,765
square miles. A further 0.2% of the total area is water
Population density
114
people per square mile, computed rather than published
County seat
Fargo
Seat of county government.
Established
1873
152 years ago
Largest city
Fargo city
Population 136,275.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Cass County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Cass County, North Dakota from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 756 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Cass County ranks

Position among the 53 counties of North Dakota, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn North DakotaNationally
Population201,7941st of 53356th of 3,144
Land area1,765 sq mi10th of 53337th of 3,144
Population density114 per sq mi1st of 53827th of 3,144
Median household income$75,55523rd of 53809th of 3,143

Full data for Cass County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population201,794Vintage 2025 Population Estimates
Population in 2020184,897Vintage 2025 Population Estimates
2020 estimates base?184,533Vintage 2025 Population Estimates
Land area1,765 sq mi2025 Gazetteer Files
Water area2.9 sq mi2025 Gazetteer Files
Total area1,768 sq mi2025 Gazetteer Files
Population density?114 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$75,555American Community Survey 2020-2024 5-Year Estimates
Median home value$298,000American Community Survey 2020-2024 5-Year Estimates
Median age32.8American Community Survey 2020-2024 5-Year Estimates
Households83,945American Community Survey 2020-2024 5-Year Estimates
Housing units89,038American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+1,065
2,411 births, 1,346 deaths
Net migration
+1,444
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Cass County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Clay CountyMinnesota80 mi67,734
Barnes CountyNorth Dakota43 mi10,573
Traill CountyNorth Dakota29 mi7,920
Richland CountyNorth Dakota23 mi16,731
Ransom CountyNorth Dakota19 mi5,617
Norman CountyMinnesota16 mi6,336
Steele CountyNorth Dakota12 mi1,797

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 53 counties of North Dakota

Open the interactive North Dakota county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.