Voter file loaded June 5, 2026 · figures are from that file, held as a fixed record
Benton County, Washington has 137,692 active registered voters across 240 precincts, as of July 2026.
Party registration
Washington doesn't register voters by party, so there's no party breakdown to show. Party lean is usually inferred from primary participation; that data is in the voter file and available inside Motion51.
How Benton County voted for president
Election results are public records.
Benton County at a glance.
Benton County had an estimated 218,190 residents in July 2024, the tenth most populous of Washington's 39 counties, up 5.5% since the 2020 census. Of those, 162,717 are 18 or older, the voting-age population, and 16.5% are 65 or older. Its 137,692 active registered voters equal about 84.6% of that voting-age population.
It covers 1,700 square miles of land (128 people per square mile), and 17.3% of residents live outside any incorporated city or town. The largest cities and towns are Kennewick (86,728), Richland (64,372), West Richland (18,820), Prosser (6,540) and Benton City (3,876). The American Community Survey (2020-2024) puts it at a median age of 36.3, a median household income of $89,874, 33.2% of adults 25 and older holding a bachelor's degree or higher and 67.6% of occupied homes owned by the people living in them.
In 2024, 99,947 votes were cast for president, about 61.4% of the voting-age population; the Democratic ticket took 37.7% and the Republican ticket 59.6%. The two-party margin moved from R+26.1 in 2008 to R+21.9 in 2024.
- Population (2024 estimate)
- 218,190
- Population (2020 census base)
- 206,869
- Voting-age population (18+)
- 162,717
- Active voters per 100 adults
- 84.6
- Residents 65 and older
- 16.5%
- People per square mile
- 128
- Living outside incorporated places
- 17.3%
- Land area
- 1,700 sq mi
- Median age
- 36.3
- Median household income
- $89,874
- Adults 25+ with a bachelor's degree
- 33.2%
- Owner-occupied homes
- 67.6%
Largest cities and towns
- Kennewick 86,728
- Richland 64,372
- West Richland 18,820
- Prosser 6,540
- Benton City 3,876
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 37.7% | 59.6% | R+21.9 | 99,947 |
| 2020 | 37.6% | 58.6% | R+21.0 | 103,033 |
| 2016 | 32.7% | 59.3% | R+26.6 | 76,907 |
| 2012 | 35.3% | 62.3% | R+27.0 | 78,874 |
| 2008 | 36.1% | 62.2% | R+26.1 | 72,911 |
Sources: U.S. Census Bureau Vintage 2024 population estimates and 2024 Gazetteer; American Community Survey 2020–2024 5-year estimates; certified county presidential returns. Growth, density and turnout are simple arithmetic on those figures.
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