Fountain Valley first appeared as a city in the
1960 U.S. census as part of the North Coast census county division. The age distribution was 18.6% under the age of 18, 8.6% aged 18 to 24, 22.5% aged 25 to 44, 28.6% aged 45 to 64, and 21.7% who were 65 years of age or older. The median age was 45.2 years. For every 100 females, there were 94.2 males, and for every 100 females age 18 and over there were 91.8 males age 18 and over. There were 19,157 households, out of which 30.7% had children under the age of 18 living in them. Of all households, 56.2% were married-couple households, 4.4% were
cohabiting couple households, 25.4% had a female householder with no spouse or partner present, and 14.1% had a male householder with no spouse or partner present. About 18.7% of all households were made up of individuals, and 11.2% had someone living alone who was 65 years of age or older. The average household size was 2.96. There were 14,498 families (75.7% of all households). The median household income was $111,797, and the
per capita income was $48,238. About 3.8% of families and 7.3% of the population were below the poverty line.
2010 census The
2010 United States census reported that Fountain Valley had a population of 55,313. The population density was . The racial makeup of Fountain Valley was 31,225 (56.5%)
White (49.2% Non-Hispanic White), 510 (0.9%)
African American, 229 (0.4%)
Native American, 18,418 (33.3%)
Asian, 171 (0.3%)
Pacific Islander, 2,445 (4.4%) from
other races, and 2,315 (4.2%) from two or more races.
Hispanic or
Latino of any race were 7,250 persons (13.1%). The Census reported that 54,876 people (99.2% of the population) lived in households, 257 (0.5%) lived in non-institutionalized group quarters, and 180 (0.3%) were institutionalized. There were 18,648 households, out of which 6,341 (34.0%) had children under the age of 18 living in them, 11,142 (59.7%) were
opposite-sex married couples living together, 2,102 (11.3%) had a female householder with no husband present, 970 (5.2%) had a male householder with no wife present. There were 646 (3.5%)
unmarried opposite-sex partnerships, and 108 (0.6%)
same-sex married couples or partnerships. 3,451 households (18.5%) were made up of individuals, and 1,772 (9.5%) had someone living alone who was 65 years of age or older. The average household size was 2.94. There were 14,214
families (76.2% of all households); the average family size was 3.34. The population was spread out, with 11,643 people (21.0%) under the age of 18, 4,624 people (8.4%) aged 18 to 24, 13,310 people (24.1%) aged 25 to 44, 16,020 people (29.0%) aged 45 to 64, and 9,716 people (17.6%) who were 65 years of age or older. The median age was 42.6 years. For every 100 females, there were 94.9 males. For every 100 females age 18 and over, there were 92.2 males. There were 19,164 housing units at an average density of , of which 13,458 (72.2%) were owner-occupied, and 5,190 (27.8%) were occupied by renters. The homeowner vacancy rate was 0.8%; the rental vacancy rate was 3.8%. 40,718 people (73.6% of the population) lived in owner-occupied housing units and 14,158 people (25.6%) lived in rental housing units. According to the 2010 United States census, Fountain Valley had a median household income of $81,212, with 6.7% of the population living below the federal poverty line. ==Economy==