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Antioch (formerly, East Antioch, Smith's Landing, and Marshs Landing) is a city in Contra Costa County, California, United States. Located in the East Bay region of the San Francisco Bay Area along the San Joaquin-Sacramento River Delta, it is a suburb of San Francisco and Oakland.
The 2010 United States Census reported that Antioch had a population of 102,372. The population density was 3,520.0 people per square mile (1,359.1/km²).
The Census reported that 101,708 people (99.4% of the population) lived in households, 404 (0.4%) lived in non-institutionalized group quarters, and 260 (0.3%) were institutionalized. There were 32,252 households, out of which 14,664 (45.5%) had children under the age of 18 living in them, 17,010 (52.7%) were opposite-sex married couples living together, 5,718 (17.7%) had a female householder with no husband present, 2,295 (7.1%) had a male householder with no wife present. There were 2,384 (7.4%) unmarried opposite-sex partnerships, and 306 (0.9%) same-sex married couples or partnerships. 5,296 households (16.4%) were made up of individuals and 1,781 (5.5%) had someone living alone who was 65 years of age or older. The average household size was 3.15. There were 25,023 families (77.6% of all households); the average family size was 3.52.