Romine Township is located in Marion County, Illinois. As of the 2010 census, its population was 514 and it contained 227 housing units. Romine Township is centered at 38°31′N 88°45′W. According to the 2010 census, the township has a total area of 35.96 square miles, of which 35.9 square miles is land and 0.05 square miles is water.