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Brentwood is a city in Contra Costa County, California, United States. It is located in the East Bay region of the San Francisco Bay Area. The population is 51,481 as of 2010, an increase of 121 percent from 23,302 at the 2000 census.
The 2010 United States Census reported that Brentwood had a population of 51,481. The population density was 3,477.3 people per square mile (1,342.6/km²).
The Census reported that 51,335 people (99.7% of the population) lived in households, 141 (0.3%) lived in non-institutionalized group quarters, and 5 (0%) were institutionalized. There were 16,494 households, out of which 8,047 (48.8%) had children under the age of 18 living in them, 10,560 (64.0%) were opposite-sex married couples living together, 1,823 (11.1%) had a female householder with no husband present, 825 (5.0%) had a male householder with no wife present. There were 794 (4.8%) unmarried opposite-sex partnerships, and 141 (0.9%) same-sex married couples or partnerships. 2,616 households (15.9%) were made up of individuals and 1,355 (8.2%) had someone living alone who was 65 years of age or older. The average household size was 3.11. There were 13,208 families (80.1% of all households); the average family size was 3.47. The median income for a household in the town was $97,202.