Voter file loaded June 9, 2026 · figures are from that file, held as a fixed record
Mason County, Washington has 48,146 active registered voters across 58 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 Mason County voted for president
Election results are public records.
Mason County at a glance.
Mason County had an estimated 69,632 residents in July 2024, the 20th most populous of Washington's 39 counties, up 6.0% since the 2020 census. Of those, 56,178 are 18 or older, the voting-age population, and 25.2% are 65 or older. Its 48,146 active registered voters equal about 85.7% of that voting-age population.
It covers 960 square miles of land (73 people per square mile), and 84.6% of residents live outside any incorporated city or town. Its one incorporated place is Shelton (10,737 residents). The American Community Survey (2020-2024) puts it at a median age of 44.7, a median household income of $83,270, 21.9% of adults 25 and older holding a bachelor's degree or higher and 82.3% of occupied homes owned by the people living in them.
In 2024, 36,502 votes were cast for president, about 65.0% of the voting-age population; the Democratic ticket took 47.2% and the Republican ticket 49.7%. The two-party margin moved from D+8.7 in 2008 to R+2.5 in 2024.
- Population (2024 estimate)
- 69,632
- Population (2020 census base)
- 65,718
- Voting-age population (18+)
- 56,178
- Active voters per 100 adults
- 85.7
- Residents 65 and older
- 25.2%
- People per square mile
- 73
- Living outside incorporated places
- 84.6%
- Land area
- 960 sq mi
- Median age
- 44.7
- Median household income
- $83,270
- Adults 25+ with a bachelor's degree
- 21.9%
- Owner-occupied homes
- 82.3%
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 47.2% | 49.7% | R+2.5 | 36,502 |
| 2020 | 46.3% | 50.2% | R+3.9 | 37,303 |
| 2016 | 42.8% | 48.8% | R+6.0 | 27,767 |
| 2012 | 52.2% | 45.3% | D+6.9 | 27,897 |
| 2008 | 53.2% | 44.5% | D+8.7 | 28,306 |
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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