At the 2010 census Highgrove had a population of 3,988. The population density was 1,239.0 people per square mile. The racial makeup of Highgrove was 2,104 White, 162 African American, 41 Native American, 113 Asian, 13 Pacific Islander, 1,388 from other races, and 167 from two or more races. Hispanic or Latino of any race were 2,604 persons. The census reported that 3,982 people lived in households, 6 lived in non-institutionalized group quarters, and no one was institutionalized. There were 1,136 households, 553 had children under the age of 18 living in them, 610 were opposite-sex married couples living together, 188 had a female householder with no husband present, 102 had a male householder with no wife present. There were 101 unmarried opposite-sex partnerships, and 6 same-sex married couples or partnerships. 181 households were one person and 50 had someone living alone who was 65 or older. The average household size was 3.51. There were 900 families ; the average family size was 3.90. The age distribution was 1,246 people under the age of 18, 464 people aged 18 to 24, 1,038 people aged 25 to 44, 952 people aged 45 to 64, and 288 people who were 65 or older. The median age was 30.2 years. For every 100 females, there were 102.8 males. For every 100 females age 18 and over, there were 101.9 males. There were 1,227 housing units at an average density of 381.2 per square mile, of the occupied units 633 were owner-occupied and 503 were rented. The homeowner vacancy rate was 2.8%; the rental vacancy rate was 7.5%. 2,217 people lived in owner-occupied housing units and 1,765 people lived in rental housing units.
2000
At the 2000 census there were 3,445 people, 1,026 households, and 777 families in the CDP. The population density was 3,133.5 people per square mile. There were 1,090 housing units at an average density of 991.5 per square mile. The racial makeup of the CDP was 54.0% White, 4.3% Black or African American, 1.1% Native American, 2.4% Asian, 0.5% Pacific Islander, 33.6% from other races, and 4.1% from two or more races. 56.7% of the population were Hispanic or Latino of any race. Of the 1,026 households 48.9% had children under the age of 18 living with them, 51.3% were married couples living together, 16.4% had a female householder with no husband present, and 24.2% were non-families. 16.6% of households were one person and 4.2% were one person aged 65 or older. The average household size was 3.4 and the average family size was 3.8. The age distribution was 36.4% under the age of 18, 10.1% from 18 to 24, 31.1% from 25 to 44, 16.1% from 45 to 64, and 6.2% 65 or older. The median age was 27 years. For every 100 females, there were 105.9 males. For every 100 females age 18 and over, there were 103.7 males. The median household income was $30,685 and the median family income was $33,929. Males had a median income of $32,199 versus $27,177 for females. The per capita income for the CDP was $16,422. About 22.4% of families and 27.8% of the population were below the poverty line, including 38.7% of those under age 18 and 8.2% of those age 65 or over.
