 Lacawac was listed on the National Register of Historic Places in 1979.According to the United States Census Bureau, the township has a total area of 31.5 square miles (81.6 km²), of which, 30.6 square miles (79 km²) of it is land and 0.9 square miles (2 km²) of it (2.86%) is water.As of the census of 2010, there were 4,271 people, 1,770 households, and 1,238 families residing in the township.