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 distinguished by its share of foreign-born residents, 8.0% of the population. With 21,895 residents, Colusa County is a county in California. It ranks #50 among counties in California by population.
The typical household earns $75,149 a year, near the US median of $78,538. The poverty rate is 9.1%, below the national 12.4%. Home prices are steep, with the typical property valued at $375,100, with typical rent around $1,139.
Fewer adults hold degrees here than in most comparable places — 14.5%, below the national 35.0%. Most workers commute: only 5.6% work from home, below the national 14.0%, and the average commute runs about 25 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+
Largest cities in California
Other counties in California
Part of California
Metro areas in California
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.