Colusa County, California

Colusa County: County in California, United States


Colusa County is a county located in the U.S. state of California. As of the 2010 census, the population was 21,419 and a population density of 7 people per km². After 10 years in 2020 county had an estimated population of 21,558 inhabitants. Its county seat is Colusa. The county was created 173 years ago in 1849.

Quick Facts about Colusa County

Population : 21,558 (2020)
Country : United States of America
State : California (United States)
Area : 2995 km2
Water as percent of area : 0.48%
Land as percent of area : 99.52%
Named for : Rancho Colus
Altitude : 135 feet / 41 meters
Capital : Colusa
Establishment : January 01, 1850
Time Zone : Pacific Time Zone
Local time : 00:35:34 (1st February 2023)
Density : 7 Pop. per km² as of 2020
Population growth : 0.64% (2010-2020)
Colusa County locator map
Location of Colusa County on California map.
Colusa Cty Courthouse 1908 image
Colusa Cty Courthouse 1908
Colusa Cty Courthouse 1908 image


Colusa County is located at 39°10'39"N 122°14'13"W (39.1775700, -122.2370300). It has 5 neighbors: Butte County, Glenn County, Lake County, Sutter County and Yolo County.

Colusa County map

The largest city of Colusa County is Colusa with a population of 6,098. Other cities include and Williams population 5,400. See all Colusa County cities & populated places.

Colusa County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Colusa County.

City Name Population Title
Colusa 6,098 City of California
Williams 5,400 City in Colusa County, California, United States
Arbuckle 3,028 Census-designated place in Colusa County, California

Colusa County has 5 neighbours.

  • Colusa


The population of Colusa County increased by 0.64% in 10 years.

Year Population % Change Method
2010 21,419 - census
2011 21,323 -0.45% estimation process
2012 21,284 -0.18% estimation process
2013 21,250 -0.16% estimation process
2014 21,176 -0.35% estimation process
2015 21,231 0.26% estimation process
2016 21,496 1.23% estimation process
2017 21,579 0.38% estimation process
2018 21,418 -0.75% estimation process
2019 21,547 0.6% estimation process
2020 21,558 0.05% estimation process

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People born in Colusa County (1)

politician California Gibson was born in Colusa County

California Other Counties (more counties)

County Name Population Title
Los Angeles County 9,943,046 County in California, United States of America
Los Angeles 3,970,219 County seat of Los Angeles County, California; second largest city in the United States by population
San Diego County 3,332,427 San Diego County, founded in 1850, is one of 58 counties in the US state of California.
Orange County 3,166,857 County in California, United States
Riverside County 2,489,188 County in California, United States
San Bernardino County 2,189,183 County in California, United States
Santa Clara County 1,907,105 County in California, United States
Alameda County 1,662,323 County in California, United States
Sacramento County 1,559,146 County in California, United States
San Diego 1,422,420 City in San Diego County, California, United States, eighth largest city in the country by population
Laguna 1,370,232 Former census-designated place
Contra Costa County 1,152,333 County in California, United States
San Jose 1,013,616 County seat of Santa Clara County, California; tenth largest city in the United States by population
Fresno County 1,000,918 County in California, United States
Kern County 901,362
San Francisco County 866,606 County, coextensive with the city of San Francisco, California, United States