Rosemead is a city in Los Angeles County, California, United States. The 2020 United States Census reported a population of 51,185. Rosemead is part of a cluster of cities, along with Alhambra, Arcadia, Temple City, Monterey Park, San Marino, and San Gabriel, in the west San Gabriel Valley with a growing Asian-American population.

Arcadia is a city in Los Angeles County, California, United States, located about 13 miles (21 km) northeast of downtown Los Angeles in the San Gabriel Valley and at the base of the San Gabriel Mountains. It contains a series of adjacent parks consisting of the Santa Anita Park racetrack, the Los Angeles County Arboretum and Botanic Garden, and Arcadia County Park. The city had a population of 56,364 at the 2010 census, up from 53,248 at the 2000 census. The city is named after Arcadia, Greece.