Colusa County, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 50th-largest in California
The population of Colusa County, California is 21,895 as of the 2023 American Community Survey, making it the 50th-largest county in California. The median household income is $75,149, the median home value is $375,100, and the median age is 35.7.
The population of Colusa County has grown 3.0% since 2010 (21,435 → 22,074), a +0.21% annualized rate.
21,895
Population
+0.21%
Annual growth
19
People / sq mi
$75,149
Median Income
$375,100
Median Home Value
Colusa County covers 1,151 sq mi of land at 19.0 people per square mile.
About Colusa County, CA
Colusa County is a county in California with a population of 21,895. It ranks #50 among counties in California by population. The median age is 35.7, younger than the national median. The population is 51.6% male and 48.4% female.
The median household income in Colusa County is $75,149, near the US median of $74,580. 9.1% of residents live below the federal poverty level. Home values sit at a median of $375,100, with monthly rent averaging $1,139. The homeownership rate of 62.2% is lower than the national rate of 64.8%.
Educational attainment in Colusa County reflects 14.5% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 5.6% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 24.8 minutes each way.
Colusa County Population History (2010-2024)
The county of Colusa County had a population of 21,435 in 2010 and 22,074 in 2024, a 3.0% growth over 14 years. The peak was 22,093 in 2023. Average annual growth rate: 0.21%.
22,074
Population (2024)
21,435
Population (2010)
22,093
Peak (2023)
0.21%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 21,435 |
| 2011 | 21,315 |
| 2012 | 21,274 |
| 2013 | 21,239 |
| 2014 | 21,156 |
| 2015 | 21,208 |
| 2016 | 21,476 |
| 2017 | 21,558 |
| 2018 | 21,389 |
| 2019 | 21,474 |
| 2020 | 21,868 |
| 2021 | 21,931 |
| 2022 | 21,952 |
| 2023 | 22,093 |
| 2024 | 22,074 |
Race & Ethnicity
| White | 51.2% |
| Black or African American | 1.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 3.2% |
| Two or More Races | 0.0% |
Age & Sex
35.7
Median Age
48.4%
Female
51.6%
Male
15.3%
Age 65+
Age Distribution
Children (under 15): 22.0% · Seniors (65+): 15.3%
Income & Poverty
| Median household income | $75,149$-21,185 vs state |
| Mean household income | $93,585 |
| Per-capita income | $32,776 |
| Poverty rate | 9.1%+0.7% vs state |
| Unemployment rate | 5.3% |
| Employment-to-population | 57.4% |
Top Industries by Employment
The largest employment sector in Colusa County is agriculture, accounting for 19.3% of workers.
How residents commute
0.4%
Drive alone
0.8%
Carpool
80.7%
Public transit
5.6%
Work from home
24.8 min
Avg commute
Housing
$375,100$-320,300 vs state
Median home value
$1,139
Median rent
62.2%
Homeownership rate
8,157
Total housing units
91.5%
Occupied
8.5%
Vacant
37.8%
Renter-occupied
Social & access
91.0%
With health insurance
92.1%
With broadband internet
8.0%
Foreign-born
5.0%
Veterans (18+)
13.1%
With a disability
47.2%
Speak language other than English at home
Education
73.2%
High School+
14.5%
Bachelor's+
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Part of California
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County rankings
Frequently Asked Questions
Colusa County, California has a population of 21,895 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 50th-largest county in California. Population density is 19 people per square mile.
The population of Colusa County has grown 3.0% since 2010 (21,435 → 22,074), a +0.21% annualized rate.
The median household income in Colusa County, California is $75,149, with mean (average) household income of $93,585 and per-capita income of $32,776. 9.1% of residents live below the federal poverty level.
In Colusa County, the largest racial and ethnic groups are White (51.2%), Hispanic or Latino (3.2%), Black or African American (1.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Colusa County, California is 35.7 years. Residents are 48.4% female and 51.6% male.
The median home value in Colusa County is $375,100 and median monthly rent is $1,139. 62.2% of occupied housing units are owner-occupied. The county has 8,157 total housing units, 8.5% of which are vacant.
The largest employment sector in Colusa County, California is agriculture, forestry, fishing, and mining, employing 19.3% of workers. The unemployment rate is 5.3%.
Los Angeles is among the largest cities associated with Colusa County, California, with a population of 3,857,897.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.