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City of Diamond Bar
—  City  —
Location of Diamond Bar in Los Angeles County, California
Coordinates: 34°0′6″N 117°49′15″W / 34.00167°N 117.82083°W / 34.00167; -117.82083Coordinates: 34°0′6″N 117°49′15″W / 34.00167°N 117.82083°W / 34.00167; -117.82083
Country United States
State California
County Los Angeles
Incorporated (city) 1989-04-18[1]
 - Mayor Carol Herrera[2]
 - Total 14.76 sq mi (38.23 km2)
 - Land 14.76 sq mi (38.23 km2)
 - Water 0.00 sq mi (0.00 km2)  0.00%
Elevation 696 ft (212 m)
Population (January 1, 2008)
 - Total 60,360
 Density 4,089.2/sq mi (1,578.9/km2)
Time zone PST (UTC-8)
 - Summer (DST) PDT (UTC-7)
ZIP Code 91765[3]
Area code(s) 909[4]
FIPS code 06-19192
GNIS feature ID 1660549

Diamond Bar is a city in eastern Los Angeles County, California, United States. The population was about 60,360 as of January 1, 2008.[5] It is named after the "diamond over a bar" branding iron registered in 1918 by ranch owner Frederick E. Lewis.

Located at the junction of the Pomona and Orange freeways, Diamond Bar is primarily a residential city with shopping centers interspersed within the city. The city features a public Los Angeles County golf course.

Diamond Bar has the first hydrogen fueling station to be built in Southern California,[6] near the South Coast Air Quality Management District (AQMD) building.



In 1840, Jose de la Luz Linares received the 4,340 acres (18 km²) 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.

But 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 1960, adjacent to the future location of the Pomona Freeway, which was built through the area ten years later [7]. The town's development and population grew extremely fast 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 is located at 34°0′6″N 117°49′15″W / 34.00167°N 117.82083°W / 34.00167; -117.82083 (34.001652, -117.820761).[8] The city'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 larger Elsinore Fault Zone.

Positioned in the southeastern corner of the San Gabriel Valley in eastern Los Angeles County, Diamond Bar is approximately 27 miles 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 38.2 km² (14.8 mi²), with no significant bodies of water.

Both the 60 and 57 freeways run through Diamond Bar. The 10 freeway is just north of the city and the 71 is just east of the city. Major thoroughfares include Grand Ave., Diamond Bar Blvd., Pathfinder Rd. and Golden Springs Dr.


Diamond Bar
Population by year [1]

2000 56,287
1990 53,672
1980 28,045
1970 10,576

Similar to many San Gabriel Valley cities such as San Marino and Arcadia, Diamond Bar has experienced an influx of Asian American residents - especially Filipino Americans, Taiwanese, Chinese Americans, Vietnamese Americans, Korean Americans, and Indian Americans - since the 1980s. Attracted to the area's schools and the perceived prestige of a Diamond Bar address, many affluent Asian Americans commuting to areas such as Rowland Heights and Alhambra have moved to Diamond Bar as well. In addition, some Asian-oriented businesses have since appeared in the city as well.

As of the census[9] of 2000, there were 56,287 people, 17,651 households, and 14,809 families residing in the city. The population density was 1,472.4/km² (3,813.2/mi²). There were 17,959 housing units at an average density of 469.8/km² (1,216.7/mi²). The racial makeup of the city was 33.3% White, 3.9% Black or African American, 0.33% Native American, 50.4% Asian, 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 population was spread out with 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 Ron Everett and Mayor Pro Tem Carol Herrera. The remaining three council members are Wen P. Chang, Jack Tanaka, and Steve Tye. In January 2010, the city council voted unanimously to ban dancing and live entertainment in new businesses.[10]

The Los Angeles County Sheriff's Department (LASD) operates the Walnut/Diamond Bar Station in Walnut, serving Diamond Bar.[11]

The Los Angeles County Department of Health Services operates the Pomona Health Center in Pomona, serving Diamond Bar.[12]

In the state legislature Diamond Bar is located in the 29th Senate District, represented by Republican Bob Huff, and in the 60th Assembly District, represented by Republican Curt Hagman. Federally, Diamond Bar is located in California's 42nd congressional district, which has a Cook PVI of R +10[13] and is represented by Republican Gary Miller. It also pertains to the Fourth District of the Los Angeles County Board of Supervisors.


Diamond Bar has several elementary, junior high, and high schools. The city is divided into two school districts. Those south of Grand Ave are part of the Walnut Valley Unified School District and in the northern portion are part of the Pomona Unified School District.

Schools in the Pomona Unified:

Schools in the Walnut Valley Unified:

Notable natives and residents

See also


  1. ^ "Incorporation Dates of California Cities". Retrieved 2007-01-18. 
  2. ^ "City of Diamond Bar - Council Members". Retrieved 2009-05-21. 
  3. ^ "USPS - ZIP Code Lookup - Find a ZIP+ 4 Code By City Results". Retrieved 2007-01-18. 
  4. ^ "Number Administration System - NPA and City/Town Search Results". Retrieved 2007-01-18. 
  5. ^
  6. ^ South Coast Air Quality Management District (August 13, 2004). "AQMD Celebrates Grand Opening of the First Hydrogen Highway Network Fueling Station in Southern California". Press release. Retrieved 2008-05-10. 
  7. ^
  8. ^ "US Gazetteer files: 2000 and 1990". United States Census Bureau. 2005-05-03. Retrieved 2008-01-31. 
  9. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31. 
  10. ^ Diamond Bar bans dancing, live entertainment in new businesses
  11. ^ "Walnut/Diamond Bar Station." Los Angeles County Sheriff's Department. Retrieved on January 21, 2010.
  12. ^ "Pomona Health Center." Los Angeles County Department of Health Services. Retrieved on March 27, 2010.
  13. ^ "Will Gerrymandered Districts Stem the Wave of Voter Unrest?". Campaign Legal Center Blog. Retrieved 2008-02-10. 
  14. ^ "About Gary". House of Representatives web site. Retrieved 2008-06-29. 
  15. ^ Toure (2006-12-14). "America's Most Lovable Pimp". Rolling Stone. Retrieved 2008-06-29. 

External links



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