Assessor's responsibilities include:

  • Answering questions about property ownership and assessments
  • Auditing all entities doing business in the county
  • Providing information on recent property sales and other information for a fee
  • Valuing all real property
  • Valuing all taxable personal property
  • Apply all qualifying exemptions

Contrary to popular belief, the assessor does not:

  • Collect property taxes
  • Compute property tax bills
  • Establish property tax laws
  • Mail out tax bills
  • Set property tax rates


The assessor discovers and assesses all property within the county as required by law. The office must produce and deliver an assessment roll by July 1 of each year. The assessment roll becomes the base upon which local property taxes are levied, collected, and distributed to the cities, county, and special districts to fund government services.

Disclaimer: Clicking the ParcelQuest search link will direct you to an off-site data service. The data on this site does come directly from the Colusa County Assessor and is frequently updated. While we have a high confidence in the accuracy of this data, we can not be held liable for any errors, omissions, or inaccuracies. The Colusa County Assessor and the County of Colusa assume no responsibility arising from the use of this information.

Note: The maps and associated data are provided without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Before making decisions using the information provided on these maps and related data please contact the appropriate Colusa County department, and other original sources to confirm the validity of the data provided.

Parcel Maps

The assessor establishes and maintains a set of maps for assessment purposes, delineating every parcel of land in the county. These parcel maps serve as the basis for the assessment of all real property in Colusa County and are continuously updated to reflect new subdivisions and surveys. These maps are available for review and may be purchased at the assessor's office. Through the ParcelQuest link you may obtain maps, situs address, parcel number, and assessed valuations.

Assessor Office Directory