Data as of October 18, 2026 · refreshed automatically from the official California voter file
San Francisco County, CA has 535,609 active registered voters — 7.5% Republican, 62.2% Democratic, and 24.7% with no party affiliation, as of October 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 7716 | 1,147 | 858 | 74.8% |
| 2 | 7852 | 1,071 | 785 | 73.3% |
| 3 | 7719 | 1,039 | 757 | 72.86% |
| 4 | 7846 | 873 | 633 | 72.51% |
| 5 | 7801 | 1,108 | 800 | 72.2% |
| 6 | 7704 | 1,010 | 725 | 71.78% |
| 7 | 7849 | 1,052 | 755 | 71.77% |
| 8 | 7802 | 1,161 | 833 | 71.75% |
| 9 | 7715 | 1,101 | 790 | 71.75% |
| 10 | 7928 | 1,054 | 755 | 71.63% |
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 San Francisco County voted for president
Election results are public records.
San Francisco County at a glance.
San Francisco County had an estimated 827,526 residents in July 2024, the 13th most populous of California's 58 counties, down 5.8% since the 2020 census. Of those, 715,769 are 18 or older, the voting-age population, and 18.5% are 65 or older. Its 535,609 active registered voters equal about 74.8% of that voting-age population.
It covers 47 square miles of land (17,726 people per square mile). The American Community Survey (2020-2024) puts it at a median age of 40.0, a median household income of $140,970, 60.3% of adults 25 and older holding a bachelor's degree or higher and 38.2% of occupied homes owned by the people living in them. In 2024, 402,964 votes were cast for president, about 56.3% of the voting-age population; the Democratic ticket took 80.3% and the Republican ticket 15.5%.
The two-party margin moved from D+70.5 in 2008 to D+64.8 in 2024.
- Population (2024 estimate)
- 827,526
- Population (2020 census base)
- 878,392
- Voting-age population (18+)
- 715,769
- Active voters per 100 adults
- 74.8
- Residents 65 and older
- 18.5%
- People per square mile
- 17,726
- Land area
- 47 sq mi
- Median age
- 40.0
- Median household income
- $140,970
- Adults 25+ with a bachelor's degree
- 60.3%
- Owner-occupied homes
- 38.2%
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 80.3% | 15.5% | D+64.8 | 402,964 |
| 2020 | 85.3% | 12.7% | D+72.6 | 443,458 |
| 2016 | 85.5% | 9.4% | D+76.1 | 365,295 |
| 2012 | 83.4% | 13.3% | D+70.1 | 321,023 |
| 2008 | 84.2% | 13.7% | D+70.5 | 382,865 |
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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