Data as of October 18, 2026 · refreshed automatically from the official California voter file
Alameda County, CA has 981,422 active registered voters — 11.9% Republican, 57.6% Democratic, and 25.1% with no party affiliation, as of October 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 523120.00 | 783 | 689 | 87.99% |
| 2 | 224600.00 | 820 | 647 | 78.9% |
| 3 | 345600.01 | 449 | 348 | 77.51% |
| 4 | 226400.02 | 491 | 380 | 77.39% |
| 5 | 245100.00 | 836 | 642 | 76.79% |
| 6 | 205900.00 | 685 | 525 | 76.64% |
| 7 | 344700.00 | 654 | 501 | 76.61% |
| 8 | 205800.00 | 711 | 544 | 76.51% |
| 9 | 245000.00 | 809 | 615 | 76.02% |
| 10 | 225900.01 | 879 | 667 | 75.88% |
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 Alameda County voted for president
Election results are public records.
Alameda County at a glance.
Alameda County had an estimated 1,649,060 residents in July 2024, the seventh most populous of California's 58 counties, down 2.0% since the 2020 census. Of those, 1,332,423 are 18 or older, the voting-age population, and 16.4% are 65 or older. Its 981,422 active registered voters equal about 73.7% of that voting-age population.
It covers 738 square miles of land (2,236 people per square mile), and 8.7% of residents live outside any incorporated city or town. The largest cities and towns are Oakland (443,554), Fremont (228,192), Hayward (158,440), Berkeley (121,749) and San Leandro (86,571). The American Community Survey (2020-2024) puts it at a median age of 39.0, a median household income of $129,367, 52.2% of adults 25 and older holding a bachelor's degree or higher and 54.4% of occupied homes owned by the people living in them.
In 2024, 669,800 votes were cast for president, about 50.3% of the voting-age population; the Democratic ticket took 74.6% and the Republican ticket 21.0%. The two-party margin moved from D+59.5 in 2008 to D+53.6 in 2024.
- Population (2024 estimate)
- 1,649,060
- Population (2020 census base)
- 1,682,296
- Voting-age population (18+)
- 1,332,423
- Active voters per 100 adults
- 73.7
- Residents 65 and older
- 16.4%
- People per square mile
- 2,236
- Living outside incorporated places
- 8.7%
- Land area
- 738 sq mi
- Median age
- 39.0
- Median household income
- $129,367
- Adults 25+ with a bachelor's degree
- 52.2%
- Owner-occupied homes
- 54.4%
Largest cities and towns
- Oakland 443,554
- Fremont 228,192
- Hayward 158,440
- Berkeley 121,749
- San Leandro 86,571
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 74.6% | 21.0% | D+53.6 | 669,800 |
| 2020 | 80.2% | 17.7% | D+62.5 | 769,864 |
| 2016 | 79.3% | 14.9% | D+64.4 | 613,195 |
| 2012 | 78.5% | 18.7% | D+59.8 | 558,386 |
| 2008 | 78.8% | 19.3% | D+59.5 | 621,029 |
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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