Tri Counties Bank Announces Departure of EVP Retail Banking.

CHICO, Calif. -- Tri Counties Bank, a wholly-owned subsidiary of TriCo Bancshares (NASDAQ:TCBK), today announced that its Executive Vice President of Retail Banking, Andrew Mastorakis, has made the decision to leave the company effective March 31, 2007, in order to pursue other opportunities. Mr.

"Andy has played an important role as a member of the executive management team of the company and we wish him the very best in his next career move," said Rick Smith, President and Chief Executive Officer.

TriCo Bancshares and Tri Counties Bank are headquartered in Chico, California. Tri Counties Bank has a 31-year history in the banking industry. Tri Counties Bank operates 32 traditional branch locations and 22 in-store branch locations in 22 California counties, and as of December 31, 2006, had over $1.9 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 62 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.