2020 census
As of the 2020 census, Dix Hills had a population of 26,180. The population density was 1,662.3 per square mile. The median age was 43.8 years. 22.3% of residents were under the age of 18 and 18.3% of residents were 65 years of age or older. For every 100 females there were 97.9 males, and for every 100 females age 18 and over there were 96.0 males age 18 and over.
There were 8,016 households in Dix Hills, of which 39.1% had children under the age of 18 living in them. Of all households, 74.9% were married-couple households, 8.6% were households with a male householder and no spouse or partner present, and 14.0% were households with a female householder and no spouse or partner present. About 10.3% of all households were made up of individuals and 6.8% had someone living alone who was 65 years of age or older.
! Race !! Number !! Percent
|-
| White || 17,574 || 67.1%
|-
| Black or African American || 1,481 || 5.7%
|-
| American Indian and Alaska Native || 71 || 0.3%
|-
| Asian || 4,409 || 16.8%
|-
| Native Hawaiian and Other Pacific Islander || 11 || 0.0%
|-
| Some other race || 762 || 2.9%
|-
| Two or more races || 1,872 || 7.2%
|-
| Hispanic or Latino (of any race) || 2,224 || 8.5%
|}
Income
The median household income (in 2021 dollars) in Dix Hills was $184,580. The per capita income for Dix Hills was $75,486. About 4.9% of the population was below the poverty line.
Arts and culture
Dix Hills is part of the Half Hollow Hills Community Library.
Education
Dix Hills is primarily served by the Half Hollow Hills Central School District although a small portion located in the south east is within the Commack School District. The Dix Hills Fire Department consists of approximately 150 volunteer firefighters and emergency medical technicians who respond to over 2,500 calls for assistance each year.
- John Coltrane, jazz saxophonist and composer (John Coltrane Home)
- Cathy Moriarty, actress
- Todd Phillips, writer-director
-->
<!-- Unused
-->
</references>