Diamond Bar highlight
Strong Asian-American presence
Diamond Bar is home to one of the largest Asian-American populations in California, with Asian residents comprising 59 percent of the city's population as of the 2020 U.S. Census.

Diamond Bar sits within the San Gabriel Valley, one of the most ethnically diverse regions in the United States. The valley encompasses roughly 200 square miles and more than 2 million residents spread across 31 incorporated cities. Within this region, Diamond Bar has become one of the centers of Asian-American settlement, alongside cities like Walnut, Rowland Heights, and Hacienda Heights. The demographic transformation has been rapid: in 1980, Asian Americans comprised less than 6 percent of Diamond Bar's population; by 2020, they represented nearly 60 percent.
This demographic shift reflects both the natural migration of immigrant and second-generation families toward communities with established institutions, cultural centers, and familiar networks, and the appeal of Diamond Bar's suburban residential character to families seeking stable neighborhoods and schools. The community now includes multiple generations of Asian-American families who have built businesses, raised children, and invested in homes across the hillside neighborhoods. The census recorded over 55,000 residents, making it a significant demographic center in Southern California.
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