Norridge is a village in Cook County, Illinois, United States. The population was 14,572 at the 2010 census. The village and its neighbor to the east, Harwood Heights, together form an enclave within the city of Chicago (i.e. they are completely surrounded by the city). Norridge is sometimes referred to as the "Island Within a City". A history book of the same name was written by Norridge author Tom McGowen.