Northlake is a city in Cook County, Illinois, United States. The population was 12,840 at the 2020 census. The city's moniker is "The City of Fri…Northlake is a city in Cook County, Illinois, United States. The population was 12,840 at the 2020 census. The city's moniker is "The City of Friendly People". The name "Northlake" comes from two streets, North Avenue and Lake Street, which intersect on the city's West border.
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