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
Age is the most distinctive thing about Adams County: a median age of 29.2, younger than the national median. Adams County is a county in Washington with a population of 20,690. It ranks #31 among counties in Washington by population.
Household earnings are middling, with a median of $65,042 — below the US median of $78,538. The poverty rate is 16.1%, above the national 12.4%. A typical home is worth $251,300, with typical rent around $901.
College attainment is 15.4%, below the national 35.0%. Most workers commute: only 4.7% work from home, below the national 14.0%, and the average commute runs about 22 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.