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Diamond Bar, California

From Wikipedia, the free encyclopedia

Diamond Bar, California
City of Diamond Bar
A residential area among the hills of Diamond Bar City
A residential area among the hills of Diamond Bar City
Flag of Diamond Bar, California
Location of Diamond Bar in Los Angeles County, California
Location of Diamond Bar in Los Angeles County, California
Diamond Bar, California is located in the United States
Diamond Bar, California
Diamond Bar, California
Location in the United States
Coordinates: 34°0′6″N 117°49′15″W / 34.00167°N 117.82083°W / 34.00167; -117.82083
Country United States
State California
CountyLos Angeles
IncorporatedApril 18, 1989[1]
Named forDiamond Bar Ranch
 • MayorNancy A. Lyons[2]
 • Mayor Pro TemAndrew Chou
 • City CouncilStan Liu
Nancy A. Lyons
Steve Tye
 • Total14.88 sq mi (38.53 km2)
 • Land14.87 sq mi (38.51 km2)
 • Water0.01 sq mi (0.01 km2)  0.04%
Elevation696 ft (212 m)
 • Total55,072
 • Density3,703.56/sq mi (1,429.91/km2)
Time zoneUTC−8 (Pacific)
 • Summer (DST)UTC−7 (PDT)
ZIP Codes
91765,[5] 91789 (91789 is shared with Walnut, CA)
Area code[6]909
FIPS code06-19192
GNIS feature IDs1660549, 2410334

Diamond Bar is a city in eastern Los Angeles County, California, United States.[7] At the 2010 census it had a population of 55,544,[8] and in 2019 the population was estimated to be 55,720.[9] 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 communities of Brea, Walnut, Chino Hills, Rowland Heights, Pomona, City of Industry, and South Diamond Bar.[10]

Northern Diamond Bar is a part of the Pomona Unified School District.[11] Southern Diamond Bar is a part of the Walnut Valley Unified School District.[12] The city is also served by International Polytechnic High School.[13] It also has the first hydrogen fueling station to be built in Southern California,[14] near the South Coast Air Quality Management District (SCAQMD) building. Moreover, according to the 2010 United States Census, Diamond Bar has a median household income at one of the top earning percentiles in the country at $88,422, with 5.9% of the population living below the federal poverty line.[15]


Californio ranchero Ricardo Vejar owned both Rancho Los Nogales and part of Rancho San José, which make up modern-day Diamond Bar.
Californio ranchero Ricardo Vejar owned both Rancho Los Nogales and part of Rancho San José, which make up modern-day Diamond Bar.

In 1840, José de la Luz Linares received the 4,340-acre (1,760 ha) 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.[16] 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.


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 in eastern Los Angeles County, Diamond Bar is approximately 27 miles (43 km) east of Downtown Los Angeles. Neighboring communities include Walnut, Rowland Heights, and Pomona. Diamond Bar is also adjacent to the Inland Empire 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 city has a total area of 14.9 square miles (39 km2), 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 data for Diamond Bar, California
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 91
Average high °F (°C) 67.5
Average low °F (°C) 40.8
Record low °F (°C) 21
Average precipitation inches (mm) 3.11
Source: [17]


Historical population
Census Pop.
U.S. Decennial Census[18]


The 2010 United States Census[19] reported that Diamond Bar had a population of 55,544. The population density was 3,731.5 inhabitants per square mile (1,440.7/km2). The racial makeup of Diamond Bar was: 29,144 (52.5%) Asian; 18,434 (33.2%) White (21.3% Non-Hispanic White),[20] 2,288 (4.1%) African American; 178 (0.3%) Native American; 106 (0.2%) Pacific Islander; 3,237 (5.8%) from other races; and 2,157 (3.9%) from two or more races. There were 11,138 residents of Hispanic 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 1,239.8 per square mile (478.7/km2), 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.


As of the census[21] of 2000, there were 56,287 people, 17,651 households, and 14,809 families residing in the city. The population density was 3,813.2 inhabitants per square mile (1,472.4/km2). There were 17,959 housing units at an average density of 1,216.7 per square mile (469.8/km2). The racial makeup of the city was 50.4% Asian, 33.3% White, 3.9% Black or African American, 0.33% Native American, 0.12% Pacific Islander, 7.7% from other races, and 4.21% from two or more races. 18.46% of the population were Hispanic or Latino of any race.

There were 17,651 households, out of which 44.4% had children under the age of 18 living with them, 68.3% were married couples living together, 11.1% had a female householder with no husband present, and 16.1% were non-families. 12.5% of all households were made up of individuals, and 2.7% had someone living alone who was 65 years of age or older. The average household size was 3.18 and the average family size was 3.47.

In the city, the age distribution of the population shows 27.0% under the age of 18, 8.8% from 18 to 24, 29.6% from 25 to 44, 27.2% from 45 to 64, and 7.5% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 96.0 males. For every 100 females age 18 and over, there were 92.0 males.

According to the 2007 estimate, the median income for a household in the city was $87,224, and the median income for a family was $93,185. Males had a median income of $51,059 versus $37,002 for females. The per capita income for the city was $33,540. About 5.0% of families and 6.0% of the population were below the poverty line, including 5.1% of those under age 18 and 6.1% of those age 65 or over.


Diamond Bar City Council is currently headed by Mayor Nancy Lyons. The other council members are Ruth Low, Andrew Chou, Steve Tye, and Stan Liu.[2]

Public services

The Los Angeles County Sheriff's Department (LASD) operates the Walnut/Diamond Bar Station in Walnut, serving Diamond Bar.[22]

The Los Angeles County Department of Health Services operates the Pomona Health Center in Pomona, serving Diamond Bar.[23]

County, state, and federal representation

The city is in the First District of the Los Angeles County Board of Supervisors, represented by Hilda Solis.[24]

In the California State Senate, Diamond Bar is in the  29th Senate District, represented by Democrat Josh Newman. In the California State Assembly, it is in the  55th Assembly District, represented by Republican Phillip Chen.[25]

In the United States House of Representatives, Diamond Bar is in California's  39th congressional district, represented by Republican Young Kim.[26]


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.[27] 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.[27]


Top employers

According to the city's 2012 Comprehensive Annual Financial Report,[28] the top employers in the city are:

# Employer # of Employees
1 South Coast Air Quality Management District 786
2 Walnut Valley Unified School District 520
3 Transcription Services 500
4 Travelers 401
5 Magan Medical Inc 300
6 Pomona Unified School District 210
7 Carrescia James-First Team Sns 200
8 Diamond Bar High School 200
9 First Team Real Estate 150
10 Baybrook Services Inc 120

Notable people

See also


  1. ^ "California Cities by Incorporation Date". California Association of Local Agency Formation Commissions. Archived from the original (Word) on November 3, 2014. Retrieved August 25, 2014.
  2. ^ a b "Council Members". City of Diamond Bar. Archived from the original on February 6, 2015. Retrieved December 16, 2014.
  3. ^ "2020 U.S. Gazetteer Files". United States Census Bureau. Retrieved October 30, 2021.
  4. ^ "Diamond Bar". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved February 26, 2015.
  5. ^ "USPS – ZIP Code Lookup – Find a ZIP+ 4 Code By City Results". Retrieved 2007-01-18.
  6. ^ "Number Administration System – NPA and City/Town Search Results". Archived from the original on 2007-09-26. Retrieved 2007-01-18.
  7. ^ "Diamond Bar Country". Retrieved 2015-07-31.
  8. ^ "Geographic Identifiers: 2010 Census Summary File 1 (G001), Diamond Bar city, California". American FactFinder. U.S. Census Bureau. Archived from the original on February 13, 2020. Retrieved September 4, 2019.
  9. ^ "Population and Housing Unit Estimates". Retrieved May 21, 2020.
  10. ^ "Google Maps". Google Maps. Retrieved 2017-01-26.
  11. ^ "Pomona Unified". Edline. Archived from the original on 2015-01-28. Retrieved 2017-01-26.
  12. ^ "Best School Districts for Your Buck in Southern California". NerdWallet. Retrieved 2015-07-31.
  13. ^ "iPoly High School / Homepage".
  14. ^ "AQMD Celebrates Grand Opening of the First Hydrogen Highway Network Fueling Station in Southern California" (Press release). South Coast Air Quality Management District. August 13, 2004. Archived from the original on May 10, 2008. Retrieved 2008-05-10.
  15. ^ "Diamond Bar (city) QuickFacts". US Census Bureau. Archived from the original on 2015-07-18. Retrieved 2015-07-31.
  16. ^ "California State Route 60". AARoads. Retrieved 2015-07-31.
  17. ^ "Diamond Bar, CA Monthly Weather". The Weather Channel. Retrieved 2020-06-02.
  18. ^ "Census of Population and Housing". Retrieved June 4, 2015.
  19. ^ "2010 Census Interactive Population Search: CA – Diamond Bar city". U.S. Census Bureau. Archived from the original on September 23, 2015. Retrieved July 12, 2014.
  20. ^ "Diamond Bar (city) QuickFacts". United States Census Bureau. Archived from the original on July 18, 2015. Retrieved March 15, 2015.
  21. ^ "U.S. Census website". United States Census Bureau. Retrieved 2008-01-31.
  22. ^ "Walnut/Diamond Bar Station Archived 2010-01-06 at the Wayback Machine." Los Angeles County Sheriff's Department. Retrieved on January 21, 2010.
  23. ^ "Pomona Health Center." Los Angeles County Department of Health Services. Retrieved on March 27, 2010.
  24. ^ "The First District - Supervisor Hilda L Solis".
  25. ^ "Statewide Database". UC Regents. Retrieved December 16, 2014.
  26. ^ "California's  39th Congressional District - Representatives & District Map". Civic Impulse, LLC.
  27. ^ a b "Public Schools and Districts Data Files - Schools & Districts (CA Dept of Education)". Retrieved 2017-02-10.
  28. ^ "City of Diamond Bar CAFR". Archived from the original on 2013-08-26. Retrieved 2013-07-09.
  29. ^ "Jim Edmonds Stats". Baseball Almanac. Retrieved 2012-12-03.
  30. ^ "SENATOR ROBERT 'BOB' S. HUFF'S BIOGRAPHY". Project Vote Smart. Retrieved 2012-12-03.. Huff was born in Calexico, then moved to Diamond Bar in 1983, at age 30, and as of 2013 still resides there.
  31. ^ "TIFFANY PROFILE". 2010-12-17. Retrieved 2013-06-28.
  32. ^ "KIM, Jay, (1939–)". Biographical Directory of the United States Congress. Retrieved 2012-12-07.
  33. ^ "About Gary". House of Representatives web site. Archived from the original on 2008-06-25. Retrieved 2008-06-29.
  34. ^ "Morgan named U.S. Soccer's Female Athlete of the Year". Inland Valley Daily Bulletin. December 4, 2012. Archived from the original on January 21, 2013. Retrieved 2012-12-07.
  35. ^ a b "1TYM YG BOUNCE". Archived from the original on 2012-05-14. Retrieved 2012-12-12.
  36. ^ Touré (2006-12-14). "America's Most Lovable Pimp". Rolling Stone. Retrieved 2017-01-31.
  37. ^ "Keith Adam Van Horn". Retrieved 2012-12-03.
  38. ^ "Ryan Wendell". Fresno State. Archived from the original on 2012-07-22. Retrieved 2012-12-03.
  39. ^ "Jason Wright – Football bio". Archived from the original on November 18, 2010. Retrieved August 18, 2020.
  40. ^ "大谷はクラブハウスガイ うれしかった初安打の「革手」 - スポニチ Sponichi Annex 野球".

External links

This page was last edited on 29 November 2022, at 16:05
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