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Exhibit 21.1

Subsidiaries of Columbia Banking System, Inc.

Name of Subsidiary			State of Incorporation			Other Names Under Which Business is Conducted
Umpqua Bank			Oregon			Columbia Trust Company, Columbia Healthcare Banking, Columbia Private Bank, Columbia Wealth Advisors, Columbia Wealth Management, Umpqua Bank Home Lending, Umpqua Bank Equipment Leasing and Finance, Umpqua Bank Vendor Finance
Financial Pacific Reinsurance Co., Ltd.			Washington
Umpqua Master Trust I			Delaware
Umpqua Statutory Trust II			Delaware
Umpqua Statutory Trust III			Delaware
Umpqua Statutory Trust IV			Delaware
Umpqua Statutory Trust V			Connecticut
Humboldt Bancorp Statutory Trust II			Connecticut
Humboldt Bancorp Statutory Trust III			Connecticut
CIB Capital Trust			Delaware
Western Sierra Statutory Trust I			Connecticut
Western Sierra Statutory Trust II			Connecticut
Western Sierra Statutory Trust III			Delaware
Western Sierra Statutory Trust IV			Delaware
Klamath First Capital Trust I			Delaware
Lynnwood Financial Statutory Trust I			Connecticut
Lynnwood Financial Statutory Trust II			Delaware
Sterling Capital Trust III			Delaware
Sterling Capital Trust IV			Delaware
Sterling Capital Statutory Trust V			Connecticut
Sterling Capital Trust VI			Delaware
Sterling Capital Trust VII			Delaware
Sterling Capital Trust VIII			Delaware
Sterling Capital Trust IX			Delaware
Bank of Commerce Holdings Trust II			Delaware

Columbia Banking System, Inc. directly owns 100% of the voting stock or membership interest of each subsidiary listed above.