Colusa County's 2026 population is estimated at 22,036, reflecting a -0.09% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Colusa County is the 50th largest county in California. The 2010 population was 21,435 and has grown 2.8% since 2010.
Data after 2023 is projected based on recent change
Overall: 35.9 years
Female: 37.2 years
Male: 35.1 years
There are 16,070 adults, (3,410 of whom are seniors) in Colusa County.
Female: 10,367 (47.2%)
Male: 11,617 (52.8%)
The racial composition of Colusa County includes 38.51% White, 34.8% other race, and smaller percentages for Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 8,466 | 38.51% |
| Other race | 7,650 | 34.8% |
| Two or more races | 4,977 | 22.64% |
| Black or African American | 335 | 1.52% |
| Native American | 316 | 1.44% |
| Asian | 215 | 0.98% |
| Native Hawaiian or Pacific Islander | 25 | 0.11% |
Colusa County 's average per capita income is $46,991. Household income levels show a median of $75,672. The poverty rate stands at 11.39%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $97,043 | - |
| Families | $86,659 | $112,729 |
| Households | $75,672 | $95,368 |
| Non Families | $33,596 | $49,076 |
Average Income
Median Household Income
Poverty Rate