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Diamond Bar is a city in eastern
Los Angeles County Los Angeles County, officially the County of Los Angeles and sometimes abbreviated as LA County, is the most populous county in the United States, with 9,663,345 residents estimated in 2023. Its population is greater than that of 40 individua ...
,
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
, United States. The 2020 census listed a population of 55,072. It is one of a few cities in California with a majority Asian population (59.24% as of 2020). It is named after the "diamond over a bar" branding iron registered in 1918 by ranch owner Frederic E. Lewis (1884–1963). The city features a public Los Angeles County golf course. Located at the junction of the Pomona and Orange freeways, Diamond Bar is primarily residential with shopping centers interspersed throughout the city. It is surrounded by the cities of Brea,
Walnut A walnut is the edible seed of any tree of the genus '' Juglans'' (family Juglandaceae), particularly the Persian or English walnut, '' Juglans regia''. They are accessory fruit because the outer covering of the fruit is technically an i ...
, Chino Hills, Pomona, City of Industry, and the
unincorporated area An unincorporated area is a parcel of land that is not governed by a local general-purpose municipal corporation. (At p. 178.) They may be governed or serviced by an encompassing unit (such as a county) or another branch of the state (such as th ...
s of Rowland Heights and South Diamond Bar. Northern Diamond Bar is a part of the Pomona Unified School District. Southern Diamond Bar is a part of the Walnut Valley Unified School District. The city is also served by International Polytechnic High School. It also has the first hydrogen fueling station to be built in Southern California, near the
South Coast Air Quality Management District The South Coast Air Quality Management District, also using the acronym South Coast (AQMD), formed in 1976, is the air pollution agency responsible for regulating stationary sources of air pollution in the South Coast Air Basin and the Coachel ...
building.


History

In 1840, José de la Luz Linares received the Mexican land grant Rancho Los Nogales (Ranch of the Walnut Trees) from Governor Juan Alvarado. The land grant included Brea Canyon and the eastern Walnut Valley. Linares died in 1847, and his widow sold a part of the ranch to Ricardo Vejar for $100 in merchandise, 100 calves, and the assumption of her late husband's debts. Vejar also owned the Rancho San Jose to the east, and acquired the rest of Rancho Nogales over the next 10 years. However, Vejar's luck did not last that long. As time wore on – and particularly as the United States government took over California – Rancho Los Nogales was divided and sold into multiple land ranches, the largest of which was the Diamond Bar Ranch. At the time, it was one of the largest working cattle ranches in the western U.S. The entire Diamond Bar Ranch was acquired by the Transamerica Corporation in the 1950s for the purpose of developing one of the nation's first master-planned communities. Transamerica gave the Diamond Bar name to its new community and incorporated the ranch's familiar diamond and bar cattle brand into various logos (many of which are still in use today). The first houses in this development were built in 1959, adjacent to the future location of the Pomona Freeway, which was built through the area ten years later. The town's development and population grew extremely quickly after that. Transamerica oversaw all development of the community through the 1960s. The Transamerica Corporation divested itself of all its real estate ventures in the 1970s and 1980s. As a result, the Diamond Bar project was sold to multiple developers and much of its initial master plan was not implemented during the latter half of its development in the 1980s. The City of Diamond Bar was incorporated on April 18, 1989.


Geography

Diamond Bar's main road, Diamond Bar Boulevard, runs along the bottom of the valley that eventually becomes Brea Canyon, and housing developments overlook the boulevard on both sides from surrounding hills. The city lies roughly between the ends of the Chino Fault and the Whittier Fault, both part of the Elsinore Fault Zone. Positioned in the southeastern corner of the
San Gabriel Valley The San Gabriel Valley (), sometimes referred to by its initials as SGV, is one of the principal valleys of Southern California, with the city of Los Angeles directly bordering it to the west and occupying the vast majority of the southeastern ...
in eastern
Los Angeles County Los Angeles County, officially the County of Los Angeles and sometimes abbreviated as LA County, is the most populous county in the United States, with 9,663,345 residents estimated in 2023. Its population is greater than that of 40 individua ...
, Diamond Bar is approximately east of
Downtown Los Angeles Downtown Los Angeles (DTLA) is the central business district of the city of Los Angeles. It is part of the Central Los Angeles region and covers a area. As of 2020, it contains over 500,000 jobs and has a population of roughly 85,000 residents ...
. Neighboring communities include
Walnut A walnut is the edible seed of any tree of the genus '' Juglans'' (family Juglandaceae), particularly the Persian or English walnut, '' Juglans regia''. They are accessory fruit because the outer covering of the fruit is technically an i ...
, Rowland Heights, and Pomona. Diamond Bar is also adjacent to the
Inland Empire The Inland Empire (commonly abbreviated as the IE) is a metropolitan area and region inland of and adjacent to coastal Southern California, centering around the cities of San Bernardino and Riverside, and bordering Los Angeles County and Or ...
region, with Chino Hills directly to the east, and to the south of Diamond Bar lie the cities of Brea and La Habra in Orange County. According to the
United States Census Bureau The United States Census Bureau, officially the Bureau of the Census, is a principal agency of the Federal statistical system, U.S. federal statistical system, responsible for producing data about the American people and American economy, econ ...
, the city has a total area of , with no significant bodies of water. Both the CA-60 Freeway and the CA-57 Freeway run through Diamond Bar. the I-10 Freeway is just north of the city and CA-71 is just east of the city. Major thoroughfares include Grand Avenue, Diamond Bar Boulevard, Pathfinder Road, Golden Springs Drive, and Brea Canyon Road.


Climate


Demographics

Diamond Bar first appeared as a city in the 1970 U.S. Census.


2020 census

The 2020 United States census reported that Diamond Bar had a population of 55,072. The population density was . The racial makeup of Diamond Bar was 18.5%
White White is the lightest color and is achromatic (having no chroma). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully (or almost fully) reflect and scatter all the visible wa ...
, 3.3%
African American African Americans, also known as Black Americans and formerly also called Afro-Americans, are an Race and ethnicity in the United States, American racial and ethnic group that consists of Americans who have total or partial ancestry from an ...
, 0.6% Native American, 59.7% Asian, 0.2%
Pacific Islander Pacific Islanders, Pasifika, Pasefika, Pacificans, or rarely Pacificers are the peoples of the list of islands in the Pacific Ocean, Pacific Islands. As an ethnic group, ethnic/race (human categorization), racial term, it is used to describe th ...
, 7.6% from other races, and 10.2% from two or more races. Hispanic or Latino of any race were 19.6% of the population. The census reported that 99.6% of the population lived in households, 0.3% lived in non-institutionalized group quarters, and 0.1% were institutionalized. There were 18,173 households, out of which 33.7% included children under the age of 18, 61.7% were married-couple households, 3.3% were cohabiting couple households, 22.3% had a female householder with no partner present, and 12.7% had a male householder with no partner present. 13.8% of households were one person, and 6.5% were one person aged 65 or older. The average household size was 3.02. There were 14,846 families (81.7% of all households). The age distribution was 18.4% under the age of 18, 9.0% aged 18 to 24, 24.1% aged 25 to 44, 29.6% aged 45 to 64, and 18.9% who were 65years of age or older. The median age was 43.8years. For every 100 females, there were 94.5 males. There were 18,819 housing units at an average density of , of which 18,173 (96.6%) were occupied. Of these, 74.2% were owner-occupied, and 25.8% were occupied by renters. The median household income in 2023 was $106,602, with 9.1% of the population living below the poverty line.


2010 census

The 2010 United States census reported that Diamond Bar had a population of 55,544. The population density was . The racial makeup of Diamond Bar was: 29,144 (52.5%) Asian; 18,434 (33.2%)
White White is the lightest color and is achromatic (having no chroma). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully (or almost fully) reflect and scatter all the visible wa ...
(21.3% Non-Hispanic White), 2,288 (4.1%)
African American African Americans, also known as Black Americans and formerly also called Afro-Americans, are an Race and ethnicity in the United States, American racial and ethnic group that consists of Americans who have total or partial ancestry from an ...
; 178 (0.3%) Native American; 106 (0.2%)
Pacific Islander Pacific Islanders, Pasifika, Pasefika, Pacificans, or rarely Pacificers are the peoples of the list of islands in the Pacific Ocean, Pacific Islands. As an ethnic group, ethnic/race (human categorization), racial term, it is used to describe th ...
; 3,237 (5.8%) from other races; and 2,157 (3.9%) from two or more races. There were 11,138 residents of
Hispanic The term Hispanic () are people, Spanish culture, cultures, or countries related to Spain, the Spanish language, or broadly. In some contexts, Hispanic and Latino Americans, especially within the United States, "Hispanic" is used as an Ethnici ...
or Latino origin, of any race (20.1%). The Census reported that 55,415 people (99.8% of the population) lived in households, 102 (0.2%) lived in non-institutionalized group quarters, and 27 (0%) were institutionalized. There were 17,880 households, out of which 7,008 (39.2%) had children under the age of 18 living in them, 11,792 (66.0%) were opposite-sex married couples living together, 2,165 (12.1%) had a female householder with no husband present, 886 (5.0%) had a male householder with no wife present. There were 496 (2.8%) unmarried opposite-sex partnerships, and 71 (0.4%) same-sex married couples or partnerships. 2,308 households (12.9%) were made up of individuals, and 740 (4.1%) had someone living alone who was 65 years of age or older. The average household size was 3.10. There were 14,843 families (83.0% of all households); the average family size was 3.38. The age distribution of the population shows 11,895 people (21.4%) under the age of 18, 5,590 people (10.1%) aged 18 to 24, 13,585 people (24.5%) aged 25 to 44, 17,988 people (32.4%) aged 45 to 64, and 6,486 people (11.7%) who were 65 years of age or older. The median age was 41.0 years. For every 100 females, there were 95.2 males. For every 100 females age 18 and over, there were 92.3 males. There were 18,455 housing units at an average density of , of which 14,513 (81.2%) were owner-occupied, and 3,367 (18.8%) were occupied by renters. The homeowner vacancy rate was 0.9%; the rental vacancy rate was 5.2%. 45,080 people (81.2% of the population) lived in owner-occupied housing units and 10,335 people (18.6%) lived in rental housing units.


Mapping L.A.

According to
Mapping L.A. Mapping L.A. was a 2009 project of the ''Los Angeles Times''. It identified 158 cities and Unincorporated area, unincorporated areas within Los Angeles County, California. It also drew boundary lines for 114 neighborhoods within the Los Angeles, C ...
, Chinese and Mexican were the most common ancestries. Korea and Taiwan were the most common foreign places of birth in 2000.


Government

Diamond Bar City Council is currently headed by Mayor Chia Yu Teng. The other council members are Andrew Chou, Ruth Low, Stan Liu, and Steve Tye.


Public services

The
Los Angeles County Sheriff's Department The Los Angeles County Sheriff's Department (LASD), officially the County of Los Angeles Sheriff's Department, is a law enforcement agency serving Los Angeles County, California. LASD is the largest sheriff's department in the United States a ...
(LASD) operates the Walnut/Diamond Bar Station in
Walnut A walnut is the edible seed of any tree of the genus '' Juglans'' (family Juglandaceae), particularly the Persian or English walnut, '' Juglans regia''. They are accessory fruit because the outer covering of the fruit is technically an i ...
, serving Diamond Bar. The
Los Angeles County Department of Health Services Health Services Los Angeles County, officially the Los Angeles County Department of Health Services, operates the public hospitals and clinics in Los Angeles County, California, Los Angeles County and is the United States' second largest municip ...
operates the Pomona Health Center in Pomona, serving Diamond Bar.


County, state, and federal representation

The city is in the First District of the
Los Angeles County Board of Supervisors The Los Angeles County Board of Supervisors (LACBOS) is the five-member Board of Supervisors, governing body of Los Angeles County, California, United States. History On April 1, 1850 the citizens of Los Angeles elected a three-man Court of Se ...
, represented by Hilda Solis. In the
California State Senate The California State Senate is the upper house of the California State Legislature (the lower house being the California State Assembly). The state senate convenes, along with the state assembly, at the California State Capitol in Sacramento. ...
, Diamond Bar is in . In the
California State Assembly The California State Assembly is the lower house of the California State Legislature (the upper house being the California State Senate). The Assembly convenes, along with the State Senate, at the California State Capitol in Sacramento, Califor ...
, it is in . In the
United States House of Representatives The United States House of Representatives is a chamber of the Bicameralism, bicameral United States Congress; it is the lower house, with the U.S. Senate being the upper house. Together, the House and Senate have the authority under Artic ...
, Diamond Bar is in .


Education

The city is primarily divided into two Blue-ribbon districts. Diamond Bar students north of the city power lines are served by four elementary schools, one middle school, and one high school provided by the Pomona Unified School District. Students south of the power lines running through the city are part of the Walnut Valley Unified School District and are served by nine elementary schools, three middle schools, and three high schools.


Economy


Top employers

According to the city's 2012 Comprehensive Annual Financial Report, the top employers in the city are:


Notable people

* Ling Ling Chang, former California state assemblywoman and state senator * Danny Dorn,
Major League Baseball Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
player,
Arizona Diamondbacks The Arizona Diamondbacks are an American professional baseball team based in Phoenix, Arizona. The Diamondbacks compete in Major League Baseball (MLB) as a member club of the National League (NL) West Division. The franchise was established ...
* Jim Edmonds, retired Major League Baseball player, most notably with the Anaheim Angels and St. Louis Cardinals * Bob Huff, California state senator * Jay Kim, first Korean-American congressman * Ryan Lane, American actor * Gary Miller, former mayor and congressman * Ippei Mizuhara, Japanese interpreter employed by the
Los Angeles Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles, Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, ...
of
Major League Baseball Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
(MLB), most notably serving as Shohei Ohtani's interpreter. *
Alex Morgan Alexandra Morgan Carrasco (born Alexandra Patricia Morgan; July 2, 1989) is an American former professional association football, soccer player.She co-captained the United States women's national soccer team, United States national team with ...
, soccer forward, 2015 & 2019 Women's World Cup champion, Olympic gold medalist, member of the
United States women's national soccer team The United States women's national soccer team (USWNT) represents the United States in international women's soccer. The team is governed by the United States Soccer Federation and competes in CONCACAF (the Confederation of North, Central Ameri ...
*
Teddy Park Teddy Park (born Park Hong-jun on September 14, 1978) is a Korean Americans, Korean–American Rapping, rapper, songwriter, and record producer. Born in Seoul, South Korea, Park moved to the United States with his family as a young child. Wh ...
, South Korean producer and rapper; known for being a major producer for K-pop groups Blackpink,
2NE1 2NE1 (, ) is a South Korean girl group formed by YG Entertainment in 2009. The group consists of Park Bom, Bom, CL (rapper), CL, Sandara Park, Dara, and Minzy. Known for their Experimental music, musical experimentation, fashion, and stage pre ...
, and
Big Bang The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models based on the Big Bang concept explain a broad range of phenomena, including th ...
* Gary Pettis, former center fielder for the
California Angels The Los Angeles Angels are an American professional baseball team based in the Greater Los Angeles area. The Angels compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division. Since 1966, the team has pl ...
and current coach for the
Houston Astros The Houston Astros are an American professional baseball team based in Houston. The Astros compete in Major League Baseball (MLB) as a member club of the American League (AL) American League West, West Division. They are one of two major leag ...
. * Xavier Scruggs, former first baseman for the St. Louis Cardinals, born in Diamond Bar in 1987. *
Snoop Dogg Calvin Cordozar Broadus Jr. ( ; born October 20, 1971), better known by his stage name Snoop Dogg (previously Snoop Doggy Dogg), is an American rapper, record producer, and actor. Rooted in West Coast hip-hop, he is widely regarded as one of t ...
, rapper * Taebin, South Korean rapper and singer; member of hip hop group 1TYM * Keith Van Horn, retired
NBA The National Basketball Association (NBA) is a professional basketball league in North America composed of 30 teams (29 in the United States and 1 in Canada). The NBA is one of the major professional sports leagues in the United States and Ca ...
player; drafted 1st round, 2nd overall pick in the 1997 draft by the Philadelphia 76ers, later on traded to the New Jersey Nets; played with the
Philadelphia 76ers The Philadelphia 76ers, also known colloquially as the Sixers, are an American professional basketball team based in the Philadelphia metropolitan area. The 76ers compete in the National Basketball Association (NBA) as a member of the Atlan ...
,
New Jersey Nets New or NEW may refer to: Music * New, singer of K-pop group The Boyz * ''New'' (album), by Paul McCartney, 2013 ** "New" (Paul McCartney song), 2013 * ''New'' (EP), by Regurgitator, 1995 * "New" (Daya song), 2017 * "New" (No Doubt song), 1 ...
,
Milwaukee Bucks The Milwaukee Bucks are an American professional basketball team based in Milwaukee. The Bucks compete in the National Basketball Association (NBA) as a member of the Central Division (NBA), Central Division of the Eastern Conference (NBA), East ...
, and
Dallas Mavericks The Dallas Mavericks (often referred to as the Mavs) are an American professional basketball team based in Dallas. The Mavericks compete in the National Basketball Association (NBA) as a member of the Southwest Division (NBA), Southwest Divisi ...
* Ryan Wendell, offensive lineman for the
New England Patriots The New England Patriots are a professional American football team based in the Greater Boston area. The Patriots compete in the National Football League (NFL) as a member of the American Football Conference (AFC) AFC East, East division. The Pa ...
* Jason Wright, American businessman and football executive * Tiffany Young, Korean-American singer; member of girl group
Girls' Generation Girls' Generation (), also known as SNSD, is a South Korean girl group formed by SM Entertainment. The group is composed of eight members: Taeyeon, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona, and Seohyun. Originally a nine-piec ...


See also

* Freeway Complex Fire


References


External links

*
Regional Chamber of Commerce – San Gabriel Valley
* {{authority control Cities in Los Angeles County, California Incorporated cities and towns in California