USGenWeb Project
- Extensive listing of historical documents, resources, maps and records for the county.
- http://cagenweb.com/colusa/

Colusa County Clerk
- Office of the County Clerk and Recorder. Services, election precinct maps and list of archival records.
- http://www.colusacountyclerk.com/

Colusa County Superior Court
- Description of history and current facilities, including photos and directions for the Main Courthouse and Courthouse Annex.
- http://www.courtinfo.ca.gov/courts/trial/colusa/

Colusa County Farm Bureau
- Information for members, young farmers and ranchers, board of directors, and economic data.
- http://www.ccfb.com/

Colusa County Radio Information
- Local radio and frequency information for fire and prevention, law enforcement, and miscellaneous frequencies.
- http://www.norcalscan.org/colusa/