TriCo Bancshares Announces Increase in Quarterly Cash Dividend.

CHICO, Calif. -- The Board of Directors of TriCo Bancshares (NASDAQ:TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.12 (twelve cents) per share at its meeting held on November 22, 2005. The dividend is payable on December 30, 2005 to holders of record at the close of business on December 9, 2005. This quarterly cash dividend of $0.12 per share represents a 9.1% increase from the $0.11 per share cash dividend paid in each of the last six quarters.

TriCo Bancshares and Tri Counties Bank are headquartered in Chico, California. Tri Counties Bank has a 30-year history in the banking industry. Tri Counties Bank operates 32 traditional branch locations and 16 in-store branch locations in 22 California counties, and as of September 30, 2005, had over $1.78 billion in assets. Tri Counties Bank offers financial services and provides a diversified line of products and services to consumers and businesses, which include demand, savings and time deposits, consumer finance, online banking, mortgage lending, and commercial banking throughout its market area. It operates a network of 60 ATMs and a 24-hour, seven days a week telephone customer service center. Brokerage services are provided at the Bank's offices by the Bank's association with Raymond James Financial, Inc. For further information please visit the Tri Counties Bank web-site at http://www.tricountiesbank.com.