Diamond Bar, CA

Diamond Bar is a city in eastern Los Angeles County, California, United States. As of the 2010 census it had a population of 55,544, and in 2019 the population was estimated to be 55,720. It is named after the "diamond over a bar" branding iron registered in 1918 by ranch owner Frederick E. Lewis. The city features a public Los Angeles County golf course. It is also home to the Diamond Bar Country Estates, a private guarded community.

Located at the junction of the Pomona and Orange freeways, Diamond Bar is primarily residential with shopping centers interspersed throughout the city. It is surrounded by the communities of Brea, Walnut, Chino Hills, Rowland Heights, Pomona, and City of Industry.