Data as of October 18, 2026 · refreshed automatically from the official California voter file
Colusa County, CA has 10,924 active registered voters — 40.2% Republican, 30.6% Democratic, and 22.6% with no party affiliation, as of October 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 513-1 | 549 | 335 | 61.02% |
| 2 | 401-1 | 715 | 408 | 57.06% |
| 3 | 500-1 | 587 | 314 | 53.49% |
| 4 | 214 | 1,003 | 533 | 53.14% |
| 5 | 213-1 | 881 | 417 | 47.33% |
| 6 | 512-1 | 709 | 289 | 40.76% |
| 7 | 105-2 | 484 | 191 | 39.46% |
| 8 | 323 | 638 | 220 | 34.48% |
| 9 | 324 | 1,011 | 310 | 30.66% |
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 Colusa County voted for president
Election results are public records.
Colusa County at a glance.
Colusa County had an estimated 22,074 residents in July 2024, the 50th most populous of California's 58 counties, up 1.1% since the 2020 census. Of those, 16,228 are 18 or older, the voting-age population, and 16.2% are 65 or older. Its 10,924 active registered voters equal about 67.3% of that voting-age population.
It covers 1,151 square miles of land (19 people per square mile), and 44.8% of residents live outside any incorporated city or town. The largest cities and towns are Colusa (6,589) and Williams (5,598). The American Community Survey (2020-2024) puts it at a median age of 35.9, a median household income of $75,672, 16.4% of adults 25 and older holding a bachelor's degree or higher and 62.2% of occupied homes owned by the people living in them.
In 2024, 7,021 votes were cast for president, about 43.3% of the voting-age population; the Democratic ticket took 34.6% and the Republican ticket 62.9%. The two-party margin moved from R+18.1 in 2008 to R+28.3 in 2024.
- Population (2024 estimate)
- 22,074
- Population (2020 census base)
- 21,837
- Voting-age population (18+)
- 16,228
- Active voters per 100 adults
- 67.3
- Residents 65 and older
- 16.2%
- People per square mile
- 19
- Living outside incorporated places
- 44.8%
- Land area
- 1,151 sq mi
- Median age
- 35.9
- Median household income
- $75,672
- Adults 25+ with a bachelor's degree
- 16.4%
- Owner-occupied homes
- 62.2%
Largest cities and towns
- Colusa 6,589
- Williams 5,598
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 34.6% | 62.9% | R+28.3 | 7,021 |
| 2020 | 40.7% | 57.3% | R+16.6 | 7,951 |
| 2016 | 40.3% | 53.9% | R+13.6 | 6,594 |
| 2012 | 38.3% | 60.0% | R+21.7 | 5,865 |
| 2008 | 40.0% | 58.1% | R+18.1 | 6,429 |
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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