[1] It was organized in 1850 and originally named "Taylor", but shortly afterward its name was changed to make reference to the Wilmot Proviso, a contemporary piece of legislation intended to stop the spread of slavery.

[2] The Proviso Township government office is located at 4565 W. Harrison Street, Hillside, IL 60162.

According to the United States Census Bureau, Proviso Township covers an area of 29.68 square miles (76.9 km2).

The township contains these fifteen cemeteries: Concordia, Forest Home, Free Sons of Israel, Glen Oak, Immanuel, Joseph and Sons Incorporated, Menorah, Mount Carmel, Oak Ridge, Old Settlers, Parkholm, Queen of Heaven, Waldheim, and Woodlawn.

[1] Some graduates of the early 1940s were members of Company B of the 192nd Tank Battalion, an Illinois National Guard Unit, whose involvement in the Bataan Death March during World War II, has been commemorated every year in Maywood since 1942.