With 31 cities and more than 1.5 million residents, the San Gabriel Valley forms a region covering 385 square miles that stretches across portions of eastern Los Angeles County. Its cities represent more than a third of the municipalities in Los Angeles County. If it were a county, the San Gabriel Valley would be the seventh largest in California.

Among the 94,000 business establishments that form the basis of the San Gabriel Valley business community, many Fortune 500 companies have major offices or plants in the San Gabriel Valley, including Edison International and Jacobs Engineering Group. Other strong corporations headquartered in the San Gabriel Valley include Southern California Edison, Kaiser Permanente, Cathay Bank, Majestic Realty Co., Ready Pac Produce, East West Bank, Trader Joe's and Huy Fong Foods.