Thurston County Teachers Credit Union was founded in 1938 by a group of respected Olympia school teachers and community leaders seeking better loan and savings rates than were generally available during the tough post-Depression era. In 1984 the credit union name was changed to Twin County Credit Union to reflect the growth and expansion of the credit union into Grays Harbor County. Since then, the credit union has expanded to 17 branches in 5 Western Washington counties.