Voter file loaded June 9, 2026 · figures are from that file, held as a fixed record
Thurston County, Washington has 213,841 active registered voters across 307 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 Thurston County voted for president
Election results are public records.
Thurston County at a glance.
Thurston County had an estimated 302,912 residents in July 2024, the sixth most populous of Washington's 39 counties, up 2.8% since the 2020 census. Of those, 241,422 are 18 or older, the voting-age population, and 19.6% are 65 or older. Its 213,841 active registered voters equal about 88.6% of that voting-age population.
It covers 722 square miles of land (419 people per square mile), and 47.3% of residents live outside any incorporated city or town. The largest cities and towns are Lacey (58,644), Olympia (56,271), Tumwater (27,826), Yelm (11,715) and Rainier (2,506). The American Community Survey (2020-2024) puts it at a median age of 40.0, a median household income of $96,563, 38.5% of adults 25 and older holding a bachelor's degree or higher and 67.7% of occupied homes owned by the people living in them.
In 2024, 163,637 votes were cast for president, about 67.8% of the voting-age population; the Democratic ticket took 58.5% and the Republican ticket 38.1%. The two-party margin moved from D+21.7 in 2008 to D+20.4 in 2024.
- Population (2024 estimate)
- 302,912
- Population (2020 census base)
- 294,802
- Voting-age population (18+)
- 241,422
- Active voters per 100 adults
- 88.6
- Residents 65 and older
- 19.6%
- People per square mile
- 419
- Living outside incorporated places
- 47.3%
- Land area
- 722 sq mi
- Median age
- 40.0
- Median household income
- $96,563
- Adults 25+ with a bachelor's degree
- 38.5%
- Owner-occupied homes
- 67.7%
Largest cities and towns
- Lacey 58,644
- Olympia 56,271
- Tumwater 27,826
- Yelm 11,715
- Rainier 2,506
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 58.5% | 38.1% | D+20.4 | 163,637 |
| 2020 | 57.5% | 38.8% | D+18.7 | 168,134 |
| 2016 | 53.2% | 37.8% | D+15.4 | 122,301 |
| 2012 | 58.1% | 39.1% | D+19.0 | 111,652 |
| 2008 | 59.9% | 38.2% | D+21.7 | 126,709 |
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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