 The township's name is an amalgamation of Charles Marsh and Ira Field, two early settlers.According to the United States Census Bureau, the township has a total area of 36.0 square miles (93.2 km²), of which 34.8 square miles (90.2 km²) of it is land and 1.2 square miles (3.0 km²) of it (3.22%) is water.As of the census of 2000, there were 231 people, 83 households, and 63 families residing in the township.