Maine Township is one of 29 townships in Cook County, Illinois, United States. The population was 140,600 at the 2020 census. The township was founded in 1850. Maine Township is located in Cook County, directly north and east of O'Hare International Airport in Chicago. Maine Township contains portions of the Chicago suburbs of Park Ridge, Morton Grov…Maine Township is one of 29 townships in Cook County, Illinois, United States. The population was 140,600 at the 2020 census. The township was founded in 1850. Maine Township is located in Cook County, directly north and east of O'Hare International Airport in Chicago. Maine Township contains portions of the Chicago suburbs of Park Ridge, Morton Grove, Niles, Glenview, Des Plaines and Rosemont. The township also contains unincorporated sections which mostly use a Des Plaines mailing address. Even though they have a Des Plaines mailing address, the addresses follow Chicago's numbering system, where the starting points are State and Madison. Interstate 294, also known as the Tri-State Tollway, passes through Maine Township.
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