Data as of October 18, 2026 · refreshed automatically from the official California voter file
San Bernardino County, CA has 1,246,064 active registered voters — 30.2% Republican, 38.8% Democratic, and 22.3% with no party affiliation, as of October 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 0794.00 | 2,679 | 1,800 | 67.19% |
| 2 | 0793.00 | 1,982 | 1,323 | 66.75% |
| 3 | 0706.00 | 401 | 267 | 66.58% |
| 4 | 2026.00 | 652 | 432 | 66.26% |
| 5 | 0011.00 | 4,318 | 2,858 | 66.19% |
| 6 | 0795.00 | 454 | 296 | 65.2% |
| 7 | 2028.00 | 1,489 | 962 | 64.61% |
| 8 | 0852.00 | 1,782 | 1,150 | 64.53% |
| 9 | 1224.00 | 1,146 | 739 | 64.49% |
| 10 | 1221.00 | 508 | 327 | 64.37% |
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 Bernardino County voted for president
Election results are public records.
San Bernardino County at a glance.
San Bernardino County had an estimated 2,214,281 residents in July 2024, the fifth most populous of California's 58 counties, up 1.5% since the 2020 census. Of those, 1,665,133 are 18 or older, the voting-age population, and 13.3% are 65 or older. Its 1,246,064 active registered voters equal about 74.8% of that voting-age population.
It covers 20,068 square miles of land (110 people per square mile), and 13.5% of residents live outside any incorporated city or town. The largest cities and towns are San Bernardino (224,775), Fontana (218,455), Ontario (185,285), Rancho Cucamonga (176,675) and Victorville (140,721). The American Community Survey (2020-2024) puts it at a median age of 34.7, a median household income of $85,478, 23.3% of adults 25 and older holding a bachelor's degree or higher and 62.1% of occupied homes owned by the people living in them.
In 2024, 761,714 votes were cast for president, about 45.7% of the voting-age population; the Democratic ticket took 47.5% and the Republican ticket 49.7%. The two-party margin moved from D+6.3 in 2008 to R+2.2 in 2024.
- Population (2024 estimate)
- 2,214,281
- Population (2020 census base)
- 2,181,664
- Voting-age population (18+)
- 1,665,133
- Active voters per 100 adults
- 74.8
- Residents 65 and older
- 13.3%
- People per square mile
- 110
- Living outside incorporated places
- 13.5%
- Land area
- 20,068 sq mi
- Median age
- 34.7
- Median household income
- $85,478
- Adults 25+ with a bachelor's degree
- 23.3%
- Owner-occupied homes
- 62.1%
Largest cities and towns
- San Bernardino 224,775
- Fontana 218,455
- Ontario 185,285
- Rancho Cucamonga 176,675
- Victorville 140,721
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 47.5% | 49.7% | R+2.2 | 761,714 |
| 2020 | 54.2% | 43.6% | D+10.6 | 840,931 |
| 2016 | 52.2% | 42.4% | D+9.8 | 598,783 |
| 2012 | 51.6% | 46.2% | D+5.4 | 531,692 |
| 2008 | 52.1% | 45.8% | D+6.3 | 606,334 |
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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