Rosemead, located in Los Angeles County, California, had a population of 51,185 as of the 2020 census. It is part of the west San Gabriel Valley, along with nearby cities like Alhambra, San Gabriel, and Monterey Park, and has a large and growing Asian-American community.
Before Spanish colonization, the area was home to the Native American Kizh (Tongva or Gabrieleño) people. The first Mission San Gabriel Arcángel was founded there in 1771 in what is now Whittier Narrows but was later moved in 1775 to its current site in San Gabriel due to flooding. During the Spanish Colonial period, the land that includes modern-day Rosemead was managed by the San Gabriel Mission. After Mexico’s Secularization Act of 1833, this land was divided among private citizens. Following the Mexican–American War and the 1848 Treaty of Guadalupe Hidalgo, the region became part of the United States, bringing new settlers. The southern part of Rosemead was once part of Rancho Potrero Grande, a 4,431-acre land grant originally given to Manuel Antonio, a Native American overseer at the mission, and later owned by Juan Matias Sánchez.









