Patelco Credit Union was founded in 1936 as a community credit union. The union serves parts of North California, especially the San Francisco Bay Area. With a $4 billion valuation, Patelco Credit Union is one of the largest credit unions in the US. The credit union opened its doors to the public in 1983 after initially serving an organization called Pacific Telephone & Telegraph Company. It has a total of 41 branches with 1 in Chicago and the rest in Northern California.