Place:Jefferson, Cook, Illinois, United States

Jefferson Township is a former civil township in Cook County, Illinois, United States that existed as a separate municipality from 1850 until 1889 when it was annexed into the city of Chicago. Its borders were Devon Avenue on the north, Harlem Avenue on the west, Western Avenue to the east, and North Avenue to the south. This region comprised most of what is now known as the Chicago's Northwest Side including the entirety of the following community areas: Jefferson Park, Avondale, Logan Square, Hermosa, Forest Glen, Dunning, Albany Park, Portage Park, Irving Park, Montclare and Belmont-Cragin.

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