EXHIBIT 21 ZIONS BANCORPORATION AND SUBSIDIARIES AT DECEMBER 31, 1998 SUBSIDIARY STATE ---------- ----- Zions First National Bank Federally chartered doing business in Utah and Idaho California Bank & Trust California Vectra Bank Colorado Federally chartered doing business in Colorado and New Mexico National Bank of Arizona Federally chartered doing business in Arizona Nevada State Bank Nevada The Commerce Bank of Washington Federally chartered doing business in Washington Val Cor Bancorporation, Inc. Colorado Cash Access, Inc. Utah GB Capital Trust Delaware Great Western Financial Corporation Utah Lockhart Realty Company Utah VBC Capital I Delaware Zions Management Services Company Utah Zions Insurance Agency, Inc. Utah Zions Life Insurance Company Arizona