Data as of October 18, 2026 · refreshed automatically from the official California voter file
Placer County, CA has 299,720 active registered voters — 40.6% Republican, 31.1% Democratic, and 19.6% with no party affiliation, as of October 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 0254401 | 802 | 720 | 89.78% |
| 2 | 0254402 | 1,021 | 912 | 89.32% |
| 3 | 0254495 | 1,161 | 1,035 | 89.15% |
| 4 | 0257511 | 1,116 | 985 | 88.26% |
| 5 | 0254497 | 434 | 381 | 87.79% |
| 6 | 0254506 | 873 | 759 | 86.94% |
| 7 | 0254409 | 1,032 | 896 | 86.82% |
| 8 | 0254406 | 485 | 421 | 86.8% |
| 9 | 0157409 | 1,127 | 978 | 86.78% |
| 10 | 0157408 | 962 | 829 | 86.17% |
Supervoters are active registered voters who cast a ballot in at least 3 of the last 4 November general elections (2018–2024). Percentages are precinct totals from the official state voter file — no individual voter information is shown. Precincts with fewer than 400 active voters are excluded.
How Placer County voted for president
Election results are public records.
Placer County at a glance.
Placer County had an estimated 433,822 residents in July 2024, the 22nd most populous of California's 58 counties, up 7.2% since the 2020 census. Of those, 341,342 are 18 or older, the voting-age population, and 21.2% are 65 or older. Its 299,720 active registered voters equal about 87.8% of that voting-age population.
It covers 1,407 square miles of land (308 people per square mile), and 26.8% of residents live outside any incorporated city or town. The largest cities and towns are Roseville (163,304), Rocklin (75,129), Lincoln (56,268), Auburn (13,780) and Loomis (6,939). The American Community Survey (2020-2024) puts it at a median age of 42.5, a median household income of $115,998, 43.2% of adults 25 and older holding a bachelor's degree or higher and 74.8% of occupied homes owned by the people living in them.
In 2024, 234,809 votes were cast for president, about 68.8% of the voting-age population; the Democratic ticket took 44.3% and the Republican ticket 52.8%. The two-party margin moved from R+11.3 in 2008 to R+8.5 in 2024.
- Population (2024 estimate)
- 433,822
- Population (2020 census base)
- 404,752
- Voting-age population (18+)
- 341,342
- Active voters per 100 adults
- 87.8
- Residents 65 and older
- 21.2%
- People per square mile
- 308
- Living outside incorporated places
- 26.8%
- Land area
- 1,407 sq mi
- Median age
- 42.5
- Median household income
- $115,998
- Adults 25+ with a bachelor's degree
- 43.2%
- Owner-occupied homes
- 74.8%
Largest cities and towns
- Roseville 163,304
- Rocklin 75,129
- Lincoln 56,268
- Auburn 13,780
- Loomis 6,939
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 44.3% | 52.8% | R+8.5 | 234,809 |
| 2020 | 45.5% | 52.1% | R+6.6 | 235,017 |
| 2016 | 41.2% | 52.5% | R+11.3 | 150,532 |
| 2012 | 38.9% | 58.9% | R+20.0 | 126,325 |
| 2008 | 43.4% | 54.7% | R+11.3 | 173,107 |
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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