TTCU Federal Credit Union is the second largest credit union in Oklahoma, serving more than 130,000 members with 16 branch locations. Established in 1934, TTCU is a full-service financial institution offering a full complement of products and services. As a not-for-profit organization, TTCUs financial success is returned to our members in the form of low-rate loans and high-rate savings accounts. Call us at 918-749-8828, 1-800-234-8828 or visit our website for more information. Federally insured by NCUA. Equal Housing Lender. TTCUs Facebook page may link to third party websites. TTCU does not endorse or control the content of these external sites.