As of the 2010 census, its population was 57,055 and it contained 19,720 housing units.

[2] According to the 2010 census, the township has a total area of 36.83 square miles (95.4 km2), of which 36.8 square miles (95 km2) (or 99.92%) is land and 0.03 square miles (0.078 km2) (or 0.08%) is water.

[2] It includes almost all of Frankfort and Mokena as well as small portions of Tinley Park and Orland Park.

Frankfort Township is bordered by Harlem Avenue (Illinois Route 43) on the east (where Cook County and Will County share a border), 183rd Street and Orland Parkway on the north (which is also the Cook-Will county border), Townline Road on the west, and Steger Road on the south.

The township contains these eight cemeteries: Frankfort Township, Frankfort, Pioneer Memorial, Pleasant Hill, Saint John's United Church of Christ, Saint Mary's, Stellwagen, and Union Burial Society.