Montgomery Township is one of ten townships in Crawford County, Illinois, USA. As of the 2020 census, its population was 671 and it contained 289 housing units. According to the 2021 census gazetteer files, Montgomery Township has a total area of 54.49 square miles, of which 54.04 square miles is land and 0.45 square miles is water. The Wabash River defin…Montgomery Township is one of ten townships in Crawford County, Illinois, USA. As of the 2020 census, its population was 671 and it contained 289 housing units. According to the 2021 census gazetteer files, Montgomery Township has a total area of 54.49 square miles, of which 54.04 square miles is land and 0.45 square miles is water. The Wabash River defines its eastern border.