Demographics and ethnic diversity
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The total population of the San Gabriel Valley in the 2000 Census was 1,510,378 people, of which 1,425,596 were living in the 30 incorporated cities. The average size of a household in the San Gabriel Valley according to the 2000 Census was 3.28 persons compared with 2.98 persons for Los Angeles County as a whole. Eight cities in the Valley have average household sizes of over four persons, while an unincorporated area, the South San Jose Hills, was at a significant 5.07 persons per household. (Most addresses do not use South San Jose Hills as the city but use La Puente, West Covina, or Valinda.) At the other end of this scale is Sierra Madre, at 2.20 persons per household.
The age distribution in the San Gabriel Valley was a little unusual when compared with the county. A larger share of the population was aged 10–19, 15.5% versus 14.8% for the county. Also, the Valley had a higher share of people over 45 years of age. The income ranges in the San Gabriel Valley area are also quite wide. The highest median household income was found in San Marino ($117,267), followed by Bradbury ($100,454). At the other end of the scale was El Monte with a median household income of $32,439. Four other cities in the Valley had household incomes of less than $40,000.
Significant percentages of all major ethnic groups reside in San Gabriel Valley communities, and the area is in general one of the most ethnically diverse regions in the country. The largest groups residing in the San Gabriel Valley are those of Hispanic and Asian-American origin. The communities of Glendora, La Verne, Claremont, Monrovia, Sierra Madre, Pasadena, South Pasadena, and San Dimas have significant White populations.
The Gabrieleno/Tongva of San Gabriel are headquartered in San Gabriel. A small Native American population is also located in Arcadia, Rowland Heights, Walnut, and Diamond Bar. Despite the European influx they remained an integral part of the Southern California community, and continue to in the present day.
The African-American population in the San Gabriel Valley is relatively low. However, there are sizable, long-established African-American communities in the western Altadena area and in northwest Pasadena, as well as in Monrovia.
Montebello is home to the oldest Armenian community in Los Angeles County. It contains Holy Cross Armenian Apostolic Cathedral, which was the only Armenian cathedral in California until Saint Leon Cathedral was built in Burbank in 2012. The Armenian Martyrs Monument at Bicknell Park commemorating the victims of the Armenian Genocide by the Ottoman Turks is the largest monument of the genocide found on public property in the world. The Armenian community of Pasadena has its roots in the 1890s. The Pashgian Bros. Oriental Rugs and Fine Carpets was established in 1889.
Hispanic residents, predominately Mexican Americans, are concentrated in Alhambra, Baldwin Park, City of Industry, El Monte, Hacienda Heights, La Puente, Montebello, Rosemead, San Gabriel, South El Monte, West Covina, Covina, Pomona, and Whittier, with significant populations in Pasadena and South Pasadena.
Asian-American population[edit]
Main article: Chinese enclaves in the San Gabriel Valley
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The San Gabriel Valley has the largest concentration of East Asian American communities in the United States, located primarily in the southwestern part of the San Gabriel Valley. Eight of the ten cities in the United States with the largest proportion of Chinese Americans are located in the San Gabriel Valley. The cities and communities of Monterey Park, Walnut, Alhambra, San Gabriel, San Marino, Rowland Heights, Hacienda Heights, Diamond Bar, and Arcadia form a large Asian-American community.
There are many Filipino Americans in the communities of West Covina and Walnut. Vietnamese Americans tend to be concentrated in San Gabriel, Rosemead, and El Monte. Many Korean Americans live in Hacienda Heights, Rowland Heights, and Diamond Bar. A longstanding Japanese-American community exists in Monterey Park.
Early Chinese pioneers settled into the Valley mostly as laborers. They packed oranges, picked walnuts, did construction, owned or worked in laundries, and worked as cooks and servants in the homes of the wealthy. Mostly a bachelor society (especially after the Page Act of 1875 banned Chinese women), the early Chinese did not leave many descendants. By the late 1880s, there was a growing Japanese pioneer population. Filipinos and Asian Indians also served as laborers in the valley. Immigration of Chinese laborers was banned by the 1882 Chinese Exclusion Act until 1943.
Almost a century later, the San Gabriel Valley's burgeoning population of Asian Americans has become a dominant cultural force. Several business districts developed to serve their needs creating a collection of Southern California Chinatowns loosely connected along the Valley Boulevard Corridor. This trend began in the city of Monterey Park during the late 1970s when many well-to-do Taiwanese professionals began settling in the area. Initially, many Chinese restaurateurs and business owners used primarily Traditional Chinese script and not English names on their business signs. This changed in 1986, when the city council of Monterey Park enacted an ordinance requiring all businesses to translate their business signs and describe the nature of their businesses in English, deemed a matter of public safety.
Monterey Park is a microcosm of changing demographics, highlighting Asian American history and evolution in the San Gabriel Valley. Rosemead has a smaller group of Vietnamese and Chinese business districts. There are also small pockets of Chinese American businesses that are scattered throughout San Gabriel Valley cities. In Rowland Heights, a handful of Korean American strip malls co-exist with Chinese American businesses. Another ethnic enclave is the Filipino American business district of Little Manila, in West Covina along with an Asian indoor and outdoor shopping center. Small Chinatowns have sprung up in many cities throughout the valley.
By the 2010 census there were more than half a million Asian Americans living in San Gabriel Valley. While smaller than the Latino population in the valley, it outnumbered the White population, and had a faster growth rate. More than a quarter of the population in the region are Asian American. The largest populations of Asian Americans in San Gabriel Valley were Chinese, Filipinos, Vietnamese, Korean, Taiwanese, and Japanese.
Burmese Americans are concentrated in Alhambra.