Cass County, North Dakota Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 1st-largest in North Dakota
The population of Cass County, North Dakota is 189,286 as of the 2023 American Community Survey, making it the 1st-largest county in North Dakota. The median household income is $75,023, the median home value is $284,700, and the median age is 32.9.
The population of Cass County has grown 33.7% since 2010 (150,321 → 200,945), a +2.09% annualized rate.
189,286
Population
+2.09%
Annual growth
107
People / sq mi
$75,023
Median Income
$284,700
Median Home Value
Cass County covers 1,765 sq mi of land at 107.2 people per square mile.
About Cass County, ND
Homeownership is the standout figure in Cass County: 52.0% of homes are owner-occupied, lower than the national rate. Cass County is a county in North Dakota with a population of 189,286. That makes it one of the ten largest counties in North Dakota in the country, at #1 by population.
Households take in a median $75,023, comfortably near the US median of $78,538. The poverty rate, 5.0%, is on the lower side for US counties and below the national 12.4%. Home values run above average at $284,700, with typical rent around $930.
Degree attainment is near the top of the range for US counties: 43.3% of adults 25+ hold a bachelor’s, above the 35.0% national rate. About 8.7% of the workforce is home-based, below the national 14.0%, and the average commute runs about 18 minutes each way.
Cass County Population History (2010-2024)
The county of Cass County had a population of 150,321 in 2010 and 200,945 in 2024, a 33.7% growth over 14 years. The peak was 200,945 in 2024. Average annual growth rate: 2.10%.
200,945
Population (2024)
150,321
Population (2010)
200,945
Peak (2024)
2.10%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 150,321 |
| 2011 | 153,363 |
| 2012 | 157,534 |
| 2013 | 163,027 |
| 2014 | 166,792 |
| 2015 | 171,028 |
| 2016 | 174,562 |
| 2017 | 178,122 |
| 2018 | 180,861 |
| 2019 | 182,238 |
| 2020 | 184,897 |
| 2021 | 189,330 |
| 2022 | 193,670 |
| 2023 | 198,157 |
| 2024 | 200,945 |
Race & Ethnicity
| White | 83.5% |
| Black or African American | 6.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.5% |
| Two or More Races | 0.0% |
Age & Sex
32.9
Median Age
49.3%
Female
50.7%
Male
12.8%
Age 65+
Age Distribution
Children (under 15): 19.1% · Seniors (65+): 12.8%
Income & Poverty
| Median household income | $75,023$-926 vs state |
| Mean household income | $101,854 |
| Per-capita income | $44,593 |
| Poverty rate | 5.0%-1.2% vs state |
| Unemployment rate | 2.3% |
| Employment-to-population | 73.5% |
Top Industries by Employment
The largest employment sector in Cass County is professional & business services, accounting for 28.1% of workers.
How residents commute
0.7%
Drive alone
2.7%
Carpool
79.5%
Public transit
8.7%
Work from home
17.5 min
Avg commute
Housing
$284,700+$43,600 vs state
Median home value
$930
Median rent
52.0%
Homeownership rate
87,497
Total housing units
93.3%
Occupied
6.7%
Vacant
48.0%
Renter-occupied
Social & access
94.3%
With health insurance
96.1%
With broadband internet
37.2%
Foreign-born
5.7%
Veterans (18+)
10.5%
With a disability
91.7%
Speak language other than English at home
Education
95.8%
High School+
43.3%
Bachelor's+
Largest cities in North Dakota
Other counties in North Dakota
Part of North Dakota
Metro areas in North Dakota
County rankings
Frequently Asked Questions
Cass County, North Dakota has a population of 189,286 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 1st-largest county in North Dakota. Population density is 107 people per square mile.
The population of Cass County has grown 33.7% since 2010 (150,321 → 200,945), a +2.09% annualized rate.
The median household income in Cass County, North Dakota is $75,023, with mean (average) household income of $101,854 and per-capita income of $44,593. 5.0% of residents live below the federal poverty level.
In Cass County, the largest racial and ethnic groups are White (83.5%), Black or African American (6.5%), Hispanic or Latino (2.5%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Cass County, North Dakota is 32.9 years. Residents are 49.3% female and 50.7% male.
The median home value in Cass County is $284,700 and median monthly rent is $930. 52.0% of occupied housing units are owner-occupied. The county has 87,497 total housing units, 6.7% of which are vacant.
The largest employment sector in Cass County, North Dakota is professional, scientific, and management services, employing 28.1% of workers. The unemployment rate is 2.3%.
Fargo is among the largest cities associated with Cass County, North Dakota, with a population of 129,064.
Cass County, ND Climate
Cass County, ND has an average annual temperature of 5.1°C (41°F) and receives about 491 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
5.1°C
Avg Temp
491
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -14° / 6° | 13 mm |
| February | -10° / 13° | 10 mm |
| March | -3° / 26° | 23 mm |
| April | 6° / 43° | 44 mm |
| May | 14° / 57° | 62 mm |
| June | 19° / 66° | 80 mm |
| July | 21° / 70° | 70 mm |
| August | 20° / 68° | 65 mm |
| September | 15° / 58° | 52 mm |
| October | 8° / 46° | 41 mm |
| November | -2° / 28° | 18 mm |
| December | -10° / 13° | 13 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Cass County, ND
The most comfortable months to visit Cass County, ND are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 28°C high). The coldest is January (near -20°C low). June is usually the wettest month.
Where to stay near Cass County
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Population, race, income, age, and trends across North Dakota
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.