Westmont first appeared as a
census designated place in the
2020 U.S. census.
2020 census As of the
2020 census, Westmont had a population of 13,726. The median age was 40.8 years. 20.0% of residents were under the age of 18 and 19.0% of residents were 65 years of age or older. For every 100 females there were 92.8 males, and for every 100 females age 18 and over there were 89.2 males age 18 and over. 100.0% of residents lived in urban areas, while 0.0% lived in rural areas. There were 5,982 households in Westmont, of which 26.7% had children under the age of 18 living in them. Of all households, 46.9% were married-couple households, 17.3% were households with a male householder and no spouse or partner present, and 28.8% were households with a female householder and no spouse or partner present. About 33.0% of all households were made up of individuals and 16.1% had someone living alone who was 65 years of age or older. There were 6,286 housing units, of which 4.8% were vacant. The homeowner vacancy rate was 1.1% and the rental vacancy rate was 6.6%. ==Emergency services==