Established in 1934, TTCU Federal Credit Union is a $2.1 billion financial institution with a full complement of depository, ... lending and financial advisory services. TTCU is the second-largest credit union in Oklahoma with 18 branch locations. You may be one of over almost a million people in Oklahoma eligible to join TTCU. The membership of TTCU is over 135,000 strong and made up of teachers, school faculty, administrators, staff, students and over 600 select employee groups. For complete membership eligibility and information, please visit www.ttcu.com or call (918) 749-TTCU (8828). read more