Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Twin Township is one of the twelve townships of Preble County, Ohio, United States. The 2000 census found 2,831 people in the township, 2,315 of whom lived in the unincorporated portions of the township. Part of the village of West Alexandria is located in southern Twin Township. Statewide, other Twin Townships are located in Darke and Ross Counties.