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Diamond Bar is a city in Los Angeles County, California, United States. The population was about 60,360 as of January 1, 2008. 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, 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 tract homes went up in 1960, right next to where the Pomona Freeway (Route 60) would later pass. 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). The main road through town, Diamond Bar Boulevard, runs along the bottom of the valley that eventually becomes Brea Canyon, and development rises from the boulevard on both sides, winding back over and through the surrounding hills. The city is 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 and of Los Angeles County, Diamond Bar is approximately 27 miles east of downtown Los Angeles. Its closest San Gabriel Valley neighbors are Walnut,Rowland Heights,Pomona). The city is also adjacent to the Inland Empire region (Chino, Chino Hills, on the east, and Orange County (Brea, La Habra) to the south.

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.

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 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 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 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:

• Armstrong Elementary School (Diamond Bar)
• Diamond Point Elementary School (Diamond Bar)
• Golden Springs Elementary School (Diamond Bar)
• Pantera Elementary School (Diamond Bar)
• Lorbeer Middle School (Diamond Bar)
• Diamond Ranch High School (Pomona/Phillips Ranch)

Schools in the Walnut Valley Unified:

• Castle Rock Elementary School (Diamond Bar)
• Evergreen Elementary School (Diamond Bar)
• Maple Hill Elementary School (Diamond Bar)
• Quail Summit Elementary School (Diamond Bar)
• Chaparral Middle School (Diamond Bar)
• South Pointe Middle School (Diamond Bar)
• Diamond Bar High School (Diamond Bar)

• Bert Blyleven, Major League Baseball; retired pitcher - Minnesota Twins, Texas Rangers, Pittsburgh Pirates, Cleveland Indians, California Angels
• Rod Carew, Major League Baseball; retired first baseman/second baseman - California Angels, Minnesota Twins
• Jim Edmonds, Major League Baseball star; As of June 2008 an outfielder for the Chicago Cubs, previously with the St Louis Cardinals, the Anaheim Angels and the San Diego Padres
• Stephanie Hwang (stage name: Tiffany), member of Korean pop group Girls' Generation
• Jay Kim, first Korean-American Congressman
• Larissa Lam, Christian singer-songwriter and music composer; currently TV host on JCTV
• Natalie Mejia, Member of the pop group Girlicious
• Gary Miller,Fmr. Mayor and current Congressman
• Snoop Dogg, Rapper
• Paul Van Doren, of Vans, Inc.
• Keith Van Horn, semi-retired NBA star; played with the Philadelphia 76ers, New Jersey Nets, Milwaukee Bucks, and Dallas Mavericks.
• Mit Shah, CEO of the former Cendant