Colusa County (ⁱ/kəˈluːsə/) is a county located in the U.S. state of California. As of the 2020 census, the population was 21,839. The county seat is Colusa. It is in the northern Sacramento Valley, northwest of the state capital, Sacramento.

History

Colusa County is one of the original counties of California, created in 1850 at the time of statehood. Parts of the county's territory were given to Tehama County in 1856 and to Glenn County in 1891.

The county was named after the 1844 Rancho Colus Mexican land grant to John Bidwell. The name of the county in the original state legislative act of 1850 was spelled Colusi, and often in newspapers was spelled Coluse. The word is derived from the name of a Patwin village known as Ko'-roo or Korusi located on the west side of the Sacramento River on the site of the present-day city of Colusa. The name was established as Colusa by 1855.

Early history

Present-day Colusa County was originally home to the Patwin band of the Wintun people, whose territory included areas along the Sacramento River as well as lands extending west towards Lake County, bounded in the north by the sources of Stony Creek near Stonyford and in the south by Putah Creek.

Linguistically, the Patwin people in the Colusa area spoke two dialects of the Southern Wintuan language. River Patwin was spoken in villages along the Sacramento River, including at Korusi, site of the present city of Colusa. Hill Patwin was spoken in the plains and foothills to the west.

European settlement

Present-day Colusa County was included as part of three Mexican land grants: John Bidwell's smaller 1845 Rancho Colus grant, which included the modern city of Colusa; the larger 1844 Rancho Jimeno grant, which surrounded the Colus grant; and the 1844 Larkin's Children grant, located upriver from Colusa near the present town of Princeton, California.

Geography

According to the U.S. Census Bureau, the county has a total area of 1,156 square miles (2,990 km²), of which 1,151 square miles (2,980 km²) is land and 5.6 square miles (15 km²) (0.5%) is water. A large number of streams drain the county, including Elk Creek, Salt Creek, Stony Creek and Bear Creek.

The county's eastern boundary is formed, in part, by the Sacramento River.

Adjacent counties

Glenn County - north
Butte County - northeast
Sutter County - east
Yolo County - south
Lake County - west

National protected areas

Butte Sink National Wildlife Refuge (part)
Colusa National Wildlife Refuge
Delevan National Wildlife Refuge
Mendocino National Forest (part)
Sacramento National Wildlife Refuge (part)

Demographics

Historical population
Census	Pop.	%±
1850	115	—
1860	2,274	1,877.4%
1870	6,165	171.1%
1880	13,118	112.8%
1890	14,640	11.6%
1900	7,364	−49.7%
1910	7,732	5.0%
1920	9,290	20.2%
1930	10,258	10.4%
1940	9,788	−4.6%
1950	11,651	19.0%
1960	12,075	3.6%
1970	12,430	2.9%
1980	12,791	2.9%
1990	16,275	27.2%
2000	18,804	15.5%
2010	21,419	13.9%
2020	21,839	2.0%
2023 (est.)	22,037	2.9%
U.S. Decennial Census 1790–1960 1900–1990 1990–2000 2010 2020

2020 census

**Colusa County, California – Racial and ethnic composition**
*Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.*
Race / Ethnicity (NH = Non-Hispanic)	Pop 2000	Pop 2010	Pop 2020	% 2000	% 2010	% 2020
White alone (NH)	9,018	8,524	6,941	47.96%	39.80%	31.78%
Black or African American alone (NH)	88	168	182	0.47%	0.78%	0.83%
Native American or Alaska Native alone (NH)	316	296	280	1.68%	1.38%	1.28%
Asian alone (NH)	220	267	252	1.17%	1.25%	1.15%
Pacific Islander alone (NH)	67	59	70	0.36%	0.28%	0.32%
Other Race alone (NH)	34	29	92	0.18%	0.14%	0.42%
Mixed Race or Multi-Racial (NH)	309	272	546	1.64%	1.27%	2.50%
Hispanic or Latino (any race)	8,752	11,804	13,476	46.54%	55.11%	61.71%
Total	18,804	21,419	21,839	100.00%	100.00%	100.00%

2011

Population, race, and income
Total population	21,297
White	14,491	68.0%
Black or African American	203	1.0%
American Indian or Alaska Native	288	1.4%
Asian	252	1.2%
Native Hawaiian or other Pacific Islander	41	0.2%
Some other race	4,893	23.0%
Two or more races	1,129	5.3%
Hispanic or Latino (of any race)	11,460	53.8%
Per capita income	$21,271
Median household income	$49,558
Median family income	$55,063

Places by population, race, and income

Places by population and race
Place	Type	Population	White	Other	Asian	Black or African American	Native American	Hispanic or Latino (of any race)
Arbuckle	CDP	3,236	55.3%	43.9%	0.5%	0.0%	0.3%	66.0%
College City	CDP	70	100.0%	0.0%	0.0%	0.0%	0.0%	35.7%
Colusa	City	5,951	62.2%	32.2%	1.9%	0.9%	2.8%	56.4%
Grimes	CDP	517	64.2%	35.8%	0.0%	0.0%	0.0%	81.8%
Lodoga	CDP	185	85.4%	5.9%	0.0%	4.3%	4.3%	0.0%
Maxwell	CDP	1,144	77.4%	22.2%	0.3%	0.0%	0.0%	65.2%
Princeton	CDP	209	92.8%	2.9%	0.0%	0.0%	4.3%	7.7%
Stonyford	CDP	104	99.0%	0.0%	0.0%	1.0%	0.0%	0.0%
Williams	City	5,003	65.0%	32.7%	0.7%	1.0%	0.7%	74.3%

Places by population and income
Place	Type	Population	Per capita income	Median household income	Median family income
Arbuckle	CDP	3,236	$16,604	$48,878	$52,708
College City	CDP	70	$37,704	$62,750	$64,750
Colusa	City	5,951	$21,811	$49,100	$51,667
Grimes	CDP	517	$9,984	$30,897	$31,058
Lodoga	CDP	185	$25,004	$24,881	$65,500
Maxwell	CDP	1,144	$16,454	$43,036	$44,405
Princeton	CDP	209	$28,005	$58,571	$60,000
Stonyford	CDP	104	$21,163	$33,750	$49,250
Williams	City	5,003	$14,974	$47,934	$52,303

2010

The 2010 United States census reported that Colusa County had a population of 21,419. The racial makeup of Colusa County was 13,854 (64.7%) White, 195 (0.9%) African American, 419 (2.0%) Native American, 281 (1.3%) Asian, 68 (0.3%) Pacific Islander, 5,838 (27.3%) from other races, and 764 (3.6%) from two or more races. Hispanic or Latino of any race were 11,804 persons (55.1%).

Population reported at 2010 United States census
The County	Total Population	White	African American	Native American	Asian	Pacific Islander	other races	two or more races	Hispanic or Latino (of any race)
Colusa County	21,419	13,854	195	419	281	68	5,838	764	11,804
Incorporated cities	Total Population	White	African American	Native American	Asian	Pacific Islander	other races	two or more races	Hispanic or Latino (of any race)
Colusa	5,971	3,944	54	107	80	28	1,510	248	3,128
Williams	5,123	2,785	59	55	94	4	1,946	180	3,891
Census-designated places	Total Population	White	African American	Native American	Asian	Pacific Islander	other races	two or more races	Hispanic or Latino (of any race)
Arbuckle	3,028	1,746	18	23	18	5	1,124	94	2,116
College City	290	207	0	5	1	0	51	26	134
Grimes	391	284	7	3	1	0	65	31	258
Lodoga	197	167	16	4	2	2	3	3	8
Maxwell	1,103	734	11	14	9	2	306	27	570
Princeton	303	217	0	10	1	1	70	4	93
Stonyford	149	127	0	4	0	1	12	5	22
Other unincorporated areas	Total Population	White	African American	Native American	Asian	Pacific Islander	other races	two or more races	Hispanic or Latino (of any race)
All others not CDPs (combined)	4,864	3,643	30	194	75	25	751	146	1,584

2000

As of the census of 2000, there were 18,804 people, 6,097 households, and 4,578 families residing in the county. The population density was 16 people per square mile (6.2 people/km²). There were 6,774 housing units at an average density of 6 per square mile (2.3/km²). The racial makeup of the county was 64.3% White, 0.6% Black or African American, 2.3% Native American, 1.2% Asian, 0.4% Pacific Islander, 26.7% from other races, and 4.5% from two or more races. 46.5% of the population were Hispanic or Latino of any race. 8.5% were of German, 5.6% English, 5.5% American and 5.4% Irish ancestry according to Census 2000. 58.7% spoke English and 40.4% Spanish as their first language.

There were 6,097 households, out of which 41.4% had children under the age of 18 living with them, 59.6% were married couples living together, 9.6% had a female householder with no husband present, and 24.9% were non-families. 21.5% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older. The average household size was 3.01 and the average family size was 3.51.

In the county, the population was spread out, with 31.6% under the age of 18, 10.3% from 18 to 24, 26.9% from 25 to 44, 19.8% from 45 to 64, and 11.4% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 103.4 males. For every 100 females age 18 and over, there were 103.8 males.

The median income for a household in the county was $35,062, and the median income for a family was $40,138. Males had a median income of $32,210 versus $21,521 for females. The per capita income for the county was $14,730. About 13.0% of families and 16.1% of the population were below the poverty line, including 19.5% of those under age 18 and 8.2% of those age 65 or over.

Transportation

Major highways

Interstate 5
State Route 16
State Route 20
State Route 45

Public transportation

Colusa County Transit runs buses from Colusa to Williams, Arbuckle, Grimes and College City, with limited service to Maxwell.

Airports

Colusa County Airport is a general-aviation airport located near the city of Colusa. The closest major airport is in Sacramento.

Communities

Cities

Colusa (county seat)
Williams

Census-designated places

Unincorporated community

Sites

Population ranking

The population ranking of the following table is based on the 2010 census of Colusa County.

† county seat

Rank	City/Town/etc.	Municipal type	Population (2010 Census)
1	† Colusa	City	5,971
2	Williams	City	5,123
3	Arbuckle	CDP	3,028
4	Maxwell	CDP	1,103
5	Grimes	CDP	391
6	Princeton	CDP	303
7	College City	CDP	290
8	Lodoga	CDP	197
9	Stonyford	CDP	149
10	Colusa Rancheria	AIAN	76
11	Cortina Rancheria	AIAN	21

California Historical Landmarks

California Historical Landmarks in Colusa County:

Letts Lake

Granville Perry Swift

Colusa County Courthouse built in 1861,.
Letts Valley settled in 1855 by Jack and David Lett. Marker at Letts Lake Campground at Letts Lake.
Swift's Stone Corral, built by Granville P. Swift in 1850.

Colusa County, California facts for kids

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