Palos Heights is a city in Cook County, Illinois, United States. The population was 12,515 at the 2010 census.
According to the 2010 census, Palos Heights has a total area of 3.878 square miles (10.04 km2), of which 3.78 square miles (9.79 km2) (or 97.47%) is land and 0.098 square miles (0.25 km2) (or 2.53%) is water.
As of the 2000 census, there were 11,561 people, 4,123 households, and 3,133 families residing in the city. The population density was 2,978.6 people per square mile (1,150.1/km2). There were 4,268 housing units at an average density of 1,129.0 per square mile (435.9/km2). The racial makeup of the city was 96.39% White, 0.44% African American, 0.09% Native American, 2.06% Asian, 0.25% from other races, and 0.78% from two or more races. Hispanic or Latino of any race were 1.43% of the population.
The top five ancestries reported in Palos as of the 2000 census were Irish (27.2%), German (20.5%), Polish (14.1%), Italian (10.5%) and Dutch (9.1%).
There were 4,123 households, out of which 25.0% had children under the age of 18 living with them, 67.0% were married couples living together, 6.6% had a female householder with no husband present, and 24.0% were non-families. 22.2% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 2.98.
In the city, the population was spread out, with 20.2% under the age of 18, 8.2% from 18 to 24, 18.6% from 25 to 44, 27.5% from 45 to 64, and 25.5% who were 65 years of age or older.