Triangle Credit Union | 2,003 followers on LinkedIn. Community, Diversity, and Service: it’s not what we aspire to, it’s what we live. | Triangle Credit Union was established in 1939. With over 57,000 members, 170 employees, and 8 branches, we are the 4th largest credit union in New Hampshire. Our goal is to continue to be on the cutting edge of technology and to maintain a competitive edge with all our Online Banking Services.