Adams County, Washington Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 31st-largest in Washington
The population of Adams County, Washington is 20,690 as of the 2023 American Community Survey, making it the 31st-largest county in Washington. The median household income is $65,042, the median home value is $251,300, and the median age is 29.2.
The population of Adams County has grown 12.0% since 2010 (18,791 → 21,039), a +0.81% annualized rate.
20,690
Population
+0.81%
Annual growth
11
People / sq mi
$65,042
Median Income
$251,300
Median Home Value
Adams County covers 1,925 sq mi of land at 10.7 people per square mile.
About Adams County, WA
Adams County is a county in Washington with a population of 20,690. It ranks #31 among counties in Washington by population. The median age is 29.2, younger than the national median. The population is 51.3% male and 48.7% female.
The median household income in Adams County is $65,042, below the US median of $74,580. 16.1% of residents live below the federal poverty level. Home values sit at a median of $251,300, with monthly rent averaging $901. The homeownership rate of 69.1% is higher than the national rate of 64.8%.
Educational attainment in Adams County reflects 15.4% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 4.7% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 21.6 minutes each way.
Adams County Population History (2010-2024)
The county of Adams County had a population of 18,791 in 2010 and 21,039 in 2024, a 12.0% growth over 14 years. The peak was 21,039 in 2024. Average annual growth rate: 0.81%.
21,039
Population (2024)
18,791
Population (2010)
21,039
Peak (2024)
0.81%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 18,791 |
| 2011 | 18,876 |
| 2012 | 18,936 |
| 2013 | 19,080 |
| 2014 | 19,154 |
| 2015 | 19,208 |
| 2016 | 19,311 |
| 2017 | 19,574 |
| 2018 | 19,640 |
| 2019 | 19,959 |
| 2020 | 20,609 |
| 2021 | 20,653 |
| 2022 | 20,843 |
| 2023 | 20,857 |
| 2024 | 21,039 |
Race & Ethnicity
| White | 47.8% |
| Black or African American | 0.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 4.5% |
| Two or More Races | 0.0% |
Age & Sex
29.2
Median Age
48.7%
Female
51.3%
Male
11.8%
Age 65+
Age Distribution
Children (under 15): 29.2% · Seniors (65+): 11.8%
Income & Poverty
| Median household income | $65,042$-29,910 vs state |
| Mean household income | $82,379 |
| Per-capita income | $25,934 |
| Poverty rate | 16.1%+9.7% vs state |
| Unemployment rate | 2.5% |
| Employment-to-population | 59.0% |
Top Industries by Employment
The largest employment sector in Adams County is agriculture, accounting for 28.5% of workers.
How residents commute
0.5%
Drive alone
3.1%
Carpool
71.1%
Public transit
4.7%
Work from home
21.6 min
Avg commute
Housing
$251,300$-268,500 vs state
Median home value
$901
Median rent
69.1%
Homeownership rate
6,844
Total housing units
92.1%
Occupied
7.9%
Vacant
30.9%
Renter-occupied
Social & access
84.1%
With health insurance
91.7%
With broadband internet
20.9%
Foreign-born
3.8%
Veterans (18+)
9.8%
With a disability
48.6%
Speak language other than English at home
Education
69.9%
High School+
15.4%
Bachelor's+
Largest cities in Washington
Other counties in Washington
Part of Washington
Metro areas in Washington
County rankings
Frequently Asked Questions
Adams County, Washington has a population of 20,690 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 31st-largest county in Washington. Population density is 11 people per square mile.
The population of Adams County has grown 12.0% since 2010 (18,791 → 21,039), a +0.81% annualized rate.
The median household income in Adams County, Washington is $65,042, with mean (average) household income of $82,379 and per-capita income of $25,934. 16.1% of residents live below the federal poverty level.
In Adams County, the largest racial and ethnic groups are White (47.8%), Hispanic or Latino (4.5%), 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 Adams County, Washington is 29.2 years. Residents are 48.7% female and 51.3% male.
The median home value in Adams County is $251,300 and median monthly rent is $901. 69.1% of occupied housing units are owner-occupied. The county has 6,844 total housing units, 7.9% of which are vacant.
The largest employment sector in Adams County, Washington is agriculture, forestry, fishing, and mining, employing 28.5% of workers. The unemployment rate is 2.5%.
Seattle is among the largest cities associated with Adams County, Washington, with a population of 741,440.
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Full rankings of Washington counties
Statewide data for Washington
Population, race, income, age, and trends across Washington
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.