Proviso Township is one of 29 townships in Cook County, Illinois, United States. As of the 2010 census, its population was 151,704. 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. The Proviso Township government office is located at 4565 W. Harrison Street, Hillside, IL 60162. Geography According to the United States Census Bureau, Proviso Township covers an area of . Cities, towns, villages Bellwood Berkeley Broadview Brookfield (northwest half) Elmhurst (small portions) Forest Park Hillside Hinsdale (small portion) La Grange Park Maywood Melrose Park (vast majority) North Riverside (small portions) Northlake (south quarter) Oak Brook (parts of certain residential lots) Stone Park Westchester Western Springs (only small portion of Village) Unincorporated Town Hines at Adjacent townships Leyden Township (north) River Forest Township (northeast) Berwyn Township (east) Oak Park Township (east) Riverside Township (southeast) Lyons Township (south) Downers Grove Township, DuPage County (southwest) York Township, DuPage County (west) Addison Township, DuPage County (northwest) Cemeteries 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. Major highways Interstate 88 Interstate 290 Interstate 294 U.S. Route 12 U.S. Route 20 U.S. Route 34 Illinois Route 38 Illinois Route 64 Airports and landing strips 86th USARCOM Heliport Chicago Airmail Field (historical) Loyola University Medical Center Heliport Sauerman Heliport Landmarks Edward Hines Veterans Administration Hospital Loyola University Medical Center Millers Meadows (Forest Preserve District of Cook County) Thatcher Woods (Forest Preserve District of Cook County) Wolf Road Prairie (Forest Preserve District of Cook County & Illinois Department of Natural Resources) Demographics Education The following public high school districts serve portions of Proviso Township: Lyons Township (La Grange Park and Western Springs), Riverside-Brookfield (Brookfield, North Riverside and Riverside) and Proviso Township High Schools (Forest Park, Westchester, Maywood, Berkley, Hillside, Melrose Park, Stone Park, Broadview and Bellwood). Political districts Illinois' 3rd Congressional District Illinois' 7th Congressional District State House District 07 State House District 08 State House District 21 State House District 41 State House District 77 State House District 78 State Senate District 04 State Senate District 11 State Senate District 21 State Senate District 39 Cook County Commissioner District 1 Cook County Commissioner District