Founded in 1952,Monterra Credit Union, formerly San Mateo Credit Union remains committed to helping members achieve financial health. This simple mission has allowed us to grow—our asset size now exceeds $1 billion and we're home to more than 90,000 members—but we will never outgrow that purpose. Membership is open to anyone who lives, works, worships or attends school in San Mateo County, the City of Palo Alto and certain areas of San Francisco.