Foster County, North Dakota Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 32nd-largest in North Dakota
The population of Foster County, North Dakota is 3,372 as of the 2023 American Community Survey, making it the 32nd-largest county in North Dakota. The median household income is $83,412, the median home value is $162,800, and the median age is 43.3.
The population of Foster County has declined 0.6% since 2010 (3,343 → 3,323), a -0.04% annualized rate.
3,372
Population
-0.04%
Annual growth
5
People / sq mi
$83,412
Median Income
$162,800
Median Home Value
Foster County covers 634 sq mi of land at 5.3 people per square mile.
About Foster County, ND
Foster County is a county in North Dakota with a population of 3,372. It ranks #32 among counties in North Dakota by population. The median age is 43.3, older than the national median. The population is 51.2% male and 48.8% female.
The median household income in Foster County is $83,412, above the US median of $74,580. 5.4% of residents live below the federal poverty level. Home values sit at a median of $162,800, with monthly rent averaging $756. The homeownership rate of 77.4% is higher than the national rate of 64.8%.
Educational attainment in Foster County reflects 27.2% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 7.3% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 13.8 minutes each way.
Foster County Population History (2010-2024)
The county of Foster County had a population of 3,343 in 2010 and 3,323 in 2024, a -0.6% growth over 14 years. The peak was 3,388 in 2020. Average annual growth rate: -0.03%.
3,323
Population (2024)
3,343
Population (2010)
3,388
Peak (2020)
-0.03%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 3,343 |
| 2011 | 3,343 |
| 2012 | 3,380 |
| 2013 | 3,355 |
| 2014 | 3,337 |
| 2015 | 3,325 |
| 2016 | 3,308 |
| 2017 | 3,251 |
| 2018 | 3,212 |
| 2019 | 3,217 |
| 2020 | 3,388 |
| 2021 | 3,366 |
| 2022 | 3,377 |
| 2023 | 3,334 |
| 2024 | 3,323 |
Race & Ethnicity
| White | 94.2% |
| Black or African American | 0.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.2% |
Age & Sex
43.3
Median Age
48.8%
Female
51.2%
Male
23.1%
Age 65+
Age Distribution
Children (under 15): 17.6% · Seniors (65+): 23.1%
Income & Poverty
| Median household income | $83,412+$7,463 vs state |
| Mean household income | $94,603 |
| Per-capita income | $43,724 |
| Poverty rate | 5.4%-0.8% vs state |
| Unemployment rate | 0.1% |
| Employment-to-population | 67.4% |
Top Industries by Employment
The largest employment sector in Foster County is professional & business services, accounting for 21.0% of workers.
How residents commute
0.0%
Drive alone
1.9%
Carpool
79.1%
Public transit
7.3%
Work from home
13.8 min
Avg commute
Housing
$162,800$-78,300 vs state
Median home value
$756
Median rent
77.4%
Homeownership rate
1,782
Total housing units
85.0%
Occupied
15.0%
Vacant
22.6%
Renter-occupied
Social & access
95.3%
With health insurance
90.9%
With broadband internet
22.8%
Foreign-born
4.5%
Veterans (18+)
12.4%
With a disability
97.9%
Speak language other than English at home
Education
93.2%
High School+
27.2%
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
Foster County, North Dakota has a population of 3,372 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 32nd-largest county in North Dakota. Population density is 5 people per square mile.
The population of Foster County has declined 0.6% since 2010 (3,343 → 3,323), a -0.04% annualized rate.
The median household income in Foster County, North Dakota is $83,412, with mean (average) household income of $94,603 and per-capita income of $43,724. 5.4% of residents live below the federal poverty level.
In Foster County, the largest racial and ethnic groups are White (94.2%), Hispanic or Latino (0.8%), Black or African American (0.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Foster County, North Dakota is 43.3 years. Residents are 48.8% female and 51.2% male.
The median home value in Foster County is $162,800 and median monthly rent is $756. 77.4% of occupied housing units are owner-occupied. The county has 1,782 total housing units, 15.0% of which are vacant.
The largest employment sector in Foster County, North Dakota is professional, scientific, and management services, employing 21.0% of workers. The unemployment rate is 0.1%.
Fargo is among the largest cities associated with Foster County, North Dakota, with a population of 129,064.
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Full rankings of North Dakota counties
Statewide data for North Dakota
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.