As of the census of 2000, there were 38,278 people, 11,105 households, and 9,106 families residing in the village. The population density was 5,634.4 people per square mile (2,176.6/km²). There were 11,343 housing units at an average density of 1,669.6/sq mi (645.0/km²). The racial makeup of the village was 68.13% White, 6.13% African American, 0.28% Native American, 11.95% Asian, 0.02% Pacific Islander, 10.36% from other races, and 3.13% from two or more races. Hispanic or Latino of any race were 26.73% of the population.
There were 11,105 households out of which 49.1% had children under the age of 18 living with them, 64.4% were married couples living together, 11.8% had a female householder with no husband present, and 18.0% were non-families. 13.5% of all households were made up of individuals and 2.1% had someone living alone who was 65 years of age or older. The average household size was 3.44 and the average family size was 3.75.
In the village the population was spread out with 31.5% under the age of 18, 10.9% from 18 to 24, 35.0% from 25 to 44, 18.5% from 45 to 64, and 4.1% who were 65 years of age or older. The median age was 30 years. For every 100 females there were 106.3 males. For every 100 females age 18 and over, there were 105.9 males.
The median income for a household in the village was $61,358, and the median income for a family was $63,990. Males had a median income of $40,109 versus $29,343 for females. The per capita income for the village was $19,960. About 4.7% of families and 6.1% of the population were below the poverty line, including 7.3% of those under age 18 and 3.4% of those age 65 or over.
Hanover Park has a station on Metra's Milwaukee District/West Line, which provides daily rail service between Elgin, Illinois and Chicago, Illinois (at Union Station).