At the scenic junction of the Pomona and Orange freeways in eastern Los Angeles County lies Diamond Bar, one of the nation's first master-planned communities from the 1950s. The city's name originates from the distinctive "diamond over a bar" cattle brand used by ranch owner Frederick E. Lewis in the early 1900s — a heritage that lives on in the community's logos today. Located 27 miles east of downtown Los Angeles, Diamond Bar positions residents within reach of both LA and Orange County employment hubs.

Diamond Bar's hillside terrain creates a landscape of homes with sweeping views of the San Gabriel Valley. Housing options range from intimate apartment communities to townhomes and single-family residences. The Diamond Bar Golf Course, operated by Los Angeles County, anchors the community's recreational offerings alongside Sycamore Canyon Park and Summit Ridge Park. Average apartment rents in the area run around $2,357 for one-bedroom units and $2,707 for two-bedrooms, while the median household income of $106,000 reflects the area's desirability.

The city spans two well-regarded school districts: Pomona Unified in the north and Walnut Valley Unified in the south. Local retail centers like Diamond Bar Plaza and Diamond Bar Town Center serve residents' daily needs, while the nearby communities of Walnut, Rowland Heights, Pomona, and Chino Hills expand shopping and dining options. The city's position at the convergence of SR-57 and SR-60 provides direct access to major employment centers throughout the region, making it particularly appealing for commuters.