Colusa County was established in 1850 as one of the original 27 counties created by the first state legislature. It once encompassed all of what is now Glenn County and a portion of Tehama County. In 1891, the counties of Glenn and Colusa were split. Records prior to 1891 are still maintained in Colusa County, and those pertaining to Glenn County after the split can be found at the Glenn County recorder's office.
Colusa is centrally located approximately 70 miles north of Sacramento. Interstate 5 offers a north/south route through the county.
Colusa County’s economy is based on agriculture and agricultural-related businesses. Our country roads are lined with various waterways, natural and man-made, where you’ll find an abundance of wildlife.
Colusa County’s Mission is to provide responsive, quality governmental services in a fiscally responsible manner, while striving to preserve our agricultural heritage, promoting economic development, and supporting the interests of our communities.
Colusa County is vested by the State Legislature with the powers necessary to provide for the health and welfare of the people within our borders. Colusa County is the front-line provider of many government services, including Public Safety, Agriculture, Human Services, Government Services, and Infrastructure.