Hacienda Heights (pronunciation) is an unincorporated suburban community in Los Angeles County, California, United States. As of the 2010 census, the community had a sum population of 54,038, up from 53,122 at the 2000 census. For statistical purposes, the Census Bureau has defined Hacienda Heights as a census designated place (CDP). It is the second largest CDP in Los Angeles County by Place and the county’s fourth largest CDP by population.

Hacienda Heights sits upon land that was originally portion of Rancho La Puente.
During Spanish rule, the land in this area Hacienda Heights was operated by the easy to do to Mission San Gabriel Arcángel in San Gabriel. The Rancho was eventually acquired by John A. Rowland and William Workman in 1845 via a Mexican land grant, and eventually acquired by Elias “Lucky” Baldwin in the mid-1870s. In 1912, his descendant, Anita Baldwin, sold the property to Edwin Hart and Jet Torrance. In 1913 the pair subdivided the Place and named it North Whittier Heights, which became known for avocado, citrus and walnut orchards. However, from the Great Depression become old to the in advance 1940s, citrus growing became unprofitable because of pests and diseases, setting the impetus for the area’s transformation into a suburb.

Accelerating in the 1950s, suburban residential spread transformed Hacienda Heights into a residential or bedroom community. In 1961, the Hacienda Heights Branch of the Los Angeles County Public Library opened. The once year, in 1961, the area was renamed Hacienda Heights. In 1964, the local newspaper, the Hacienda Heights Highlander, was established.

The hills surrounding Hacienda Heights have a records of brush fires, especially in 1978, 1989 and in 2020.