0001193125-07-121536 S-4 9 20070523 20070523 COLUMBIA BANKING SYSTEM INC 0000887343 6022 911422237 WA 1231 S-4 33 333-143189 07873894 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 S-4 1 ds4.htm REGISTRATION STATEMENT EX-5 2 dex5.htm OPINION OF GRAHAM & DUNN PC REGARDING LEGALITY OF SECURITIES EX-8 3 dex8.htm OPINION OF GRAHAM & DUNN PC REGARDING FEDERAL INCOME TAX MATTERS EX-10.1 4 dex101.htm VOTING AGREEMENT OF TOWN CENTER BANCORP DIRECTORS AND EXECUTIVE OFFICERS EX-10.2 5 dex102.htm DIRECTOR NON-COMPETITION AGREEMENT EX-23.3 6 dex233.htm CONSENT OF DELOITTE & TOUCHE LLP EX-99.1 7 dex991.htm FORM OF PROXY TO BE MAILED TO SHAREHOLDERS OF TOWN CENTER BANCORP GRAPHIC 8 g92575g01v22.jpg GRAPHIC GRAPHIC 9 g92575g50y94.jpg GRAPHIC