Colusa County
| Colusa County, California | ||
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| County | ||
| County of Colusa | ||
Colusa County Courthouse
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 Location in the state of California |
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 California's location in the United States |
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| Country |
 United States
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| State |
 California
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| Region | Sacramento Valley | |
| Incorporated | February 18, 1850 | |
| County seat | Colusa | |
| Largest city | Colusa (population) Williams (area) |
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| Area | ||
| • Total | 1,156 sq mi (2,990 km2) | |
| • Land | 1,151 sq mi (2,980 km2) | |
| • Water | 5.6 sq mi (15 km2) | |
| Highest elevation | 7,059 ft (2,152 m) | |
| Population (April 1, 2010) | ||
| • Total | 21,419 | |
| • Estimate (2015) | 21,482 | |
| • Density | 19/sq mi (7.2/km2) | |
| Time zone | Pacific Time Zone (UTC-8) | |
| • Summer (DST) | Pacific Daylight Time (UTC-7) | |
| Area code | 530 | |
| Website | www |
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Colusa County is a county in the U.S. state of California. As of the 2010 census, the population was 21,419. The county seat is Colusa. It is in the Central Valley of California, northwest of the state capital, Sacramento.
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 Native American tribe living on the west side of the Sacramento River. The name was changed to Colusa shortly after. This however is disputed. The actual origin of the name is unknown.
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 and Salt Creek.
The county's eastern boundary is formed, in part, by the Sacramento River.
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%).
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