County Maps US

Adams County, Washington

A county in Washington, ranked 31 of 39 by population.

CountyFIPS 53001

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

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Population
21,488
+878 (+4.3%) since 2020
Land area
1,925
square miles. A further 0.2% of the total area is water
Population density
11.2
people per square mile, computed rather than published
County seat
Ritzville
Seat of county government.
Established
1883
142 years ago
Largest city
Othello city
Population 9,237.

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 Adams 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 Adams County, Washington 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 476 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 Adams County ranks

Position among the 39 counties of Washington, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn WashingtonNationally
Population21,48831st of 391,752nd of 3,144
Land area1,925 sq mi14th of 39296th of 3,144
Population density11.2 per sq mi32nd of 392,521st of 3,144
Median household income$66,13633rd of 391,523rd of 3,143

Full data for Adams County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population21,488Vintage 2025 Population Estimates
Population in 202020,610Vintage 2025 Population Estimates
2020 estimates base?20,610Vintage 2025 Population Estimates
Land area1,925 sq mi2025 Gazetteer Files
Water area4.8 sq mi2025 Gazetteer Files
Total area1,930 sq mi2025 Gazetteer Files
Population density?11.2 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$66,136American Community Survey 2020-2024 5-Year Estimates
Median home value$273,300American Community Survey 2020-2024 5-Year Estimates
Median age29.3American Community Survey 2020-2024 5-Year Estimates
Households6,288American Community Survey 2020-2024 5-Year Estimates
Housing units6,926American 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
+271
388 births, 117 deaths
Net migration
-107
More people moved out than moved in.

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

The 4 areas bordering Adams 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
Franklin CountyWashington55 mi102,612
Grant CountyWashington55 mi105,727
Whitman CountyWashington49 mi48,512
Lincoln CountyWashington48 mi11,982

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

All 39 counties of Washington

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

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