Frankfort Township is one of 24 townships in Will County, Illinois. As of the 2010 census, its population was 57,055 and it contained 19,720 housing units. According to the 2010 census, the township has a total area of 36.83 square miles, of which 36.8 square miles is land and 0.03 square miles is water. It includes almost all of Frankfort and Mokena as well as smal…Frankfort Township is one of 24 townships in Will County, Illinois. As of the 2010 census, its population was 57,055 and it contained 19,720 housing units. According to the 2010 census, the township has a total area of 36.83 square miles, of which 36.8 square miles is land and 0.03 square miles is water. It includes almost all of Frankfort and Mokena as well as small portions of Tinley Park and Orland Park.