As of February 2015, the corporate office of Trader Joe's is located at 800 S. Shamrock Ave., Monrovia, CA, 91016. The phone number for the corporate office is 626-599-3700.
Trader Joe's began in 1958 as a chain of convenience stores called Pronto Markets. The founder of the company changed the name and opened the first Trader Joe's store in Pasadena, California in 1967. The original store is still in the same location. In 1993, Trader Joe's opened a store in Arizona, which was the first one outside California. The company has continued to expand nationwide; by 2013 there were 400 Trader Joe's markets across the United States.