Golden 1 Credit Union Share: Credit Unions Golden 1 Credit Union 1328 W Hillsdale Blvd San Mateo , California 94403 (916) 732-2900 X3040 About Map About With over $17 billion in assets, Golden 1 Credit Union is one of the largest credit unions in the United States and proudly serves all those who live or work in California. Golden 1 delivers financial solut What's Nearby? Distance: 5 10 15 20 25 50 mi.