Northgate is a census-designated place (CDP) in Colerain Township, Hamilton County, Ohio, United States.Northgate Mall serves as a shopping hub for the west side of Cincinnati.29.7% of all households were made up of individuals, and 18.8% were someone living alone who was 65 years of age or older.[6] At the 2000 census there were 8,016 people, 2,747 households, and 2,214 families living in the CDP.This Hamilton County, Ohio state location article is a stub.