Westmont is located at . According to the United States Census Bureau, the CDP has a total area of, all land.
Demographics
2010
At the 2010 census Westmont had a population of 31,853. The population density was 17,239.9 people per square mile. The racial makeup of Westmont was 16,262 African American, 5,037 White, 188 Native American, 126 Asian, 31 Pacific Islander, 9,180 from other races, and 1,029 from two or more races. Hispanic or Latino of any race were 14,871 persons. The census reported that 31,693 people lived in households, 119 lived in non-institutionalized group quarters, and 41 were institutionalized. There were 9,695 households, 4,750 had children under the age of 18 living in them, 2,995 were opposite-sex married couples living together, 3,194 had a female householder with no husband present, 904 had a male householder with no wife present. There were 776 unmarried opposite-sex partnerships, and 52 same-sex married couples or partnerships. 2,141 households were one person and 669 had someone living alone who was 65 or older. The average household size was 3.27. There were 7,093 families ; the average family size was 3.78. The age distribution was 9,860 people under the age of 18, 3,759 people aged 18 to 24, 8,577 people aged 25 to 44, 6,979 people aged 45 to 64, and 2,678 people who were 65 or older. The median age was 29.9 years. For every 100 females, there were 86.8 males. For every 100 females age 18 and over, there were 80.3 males. There were 10,588 housing units at an average density of 5,730.6 per square mile, of the occupied units 3,012 were owner-occupied and 6,683 were rented. The homeowner vacancy rate was 2.5%; the rental vacancy rate was 8.8%. 10,864 people lived in owner-occupied housing units and 20,829 people lived in rental housing units.
2000
At the 2000 census there were 31,623 people, 9,255 households, and 7,089 families living in the CDP. The population density was 17,103.0 inhabitants per square mile. There were 10,186 housing units at an average density of 5,509.0 per square mile. The racial makeup of the CDP was 11.8% White, 58.0% African American, 0.6% Native American, 0.4% Asian, 0.2% Pacific Islander, 25.8% from other races, and 3.3% from two or more races. Hispanic or Latino of any race were 39.5%. Of the 9,255 households 47.3% had children under the age of 18 living with them, 33.9% were married couples living together, 34.9% had a female householder with no husband present, and 23.4% were non-families. 19.2% of households were one person and 5.0% were one person aged 65 or older. The average household size was 3.41 and the average family size was 3.85. The age distribution was 37.8% under the age of 18, 10.5% from 18 to 24, 29.3% from 25 to 44, 16.3% from 45 to 64, and 6.0% 65 or older. The median age was 26 years. For every 100 females, there were 86.6 males. For every 100 females age 18 and over, there were 78.5 males. The median household income was $23,323 and the median family income was $23,712. Males had a median income of $24,682 versus $25,775 for females. The per capita income for the CDP was $9,765. About 35.3% of families and 36.9% of the population were below the poverty line, including 46.7% of those under age 18 and 22.1% of those age 65 or over.
