Northlake is a city in Cook County, Illinois, United States. The population was 12,323 at the 2010 census. The city's moniker is "The City of Friendly People". The name "Northlake" came from two streets, North Avenue and Lake Street.
According to the 2010 census, Northlake has a total area of 3.17 square miles (8.21 km2), all land.
As of the census of 2010, there were 12,323 people, 3,983 households, and 2,765 families residing in the city. The population density was 3,887.4 people per square mile (1,502.8/km²). There were 4,274 housing units. The racial makeup of the city was 66.9% White, 3.2% African American, 0.5% Native American, 2.8% Asian, 0.03% Pacific Islander, 23.7% some other race, and 2.9% from two or more races. Hispanic or Latino of any race were 52.9% of the population.
There were 3,983 households out of which 33.1% had children under the age of 18 living with them, 50.8% were headed by married couples living together, 12.0% had a female householder with no husband present, and 30.6% were non-families. 26.4% of all households were individuals, and 15.4% were someone living alone who was 65 years of age or older.