Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Allen Township is one of the twenty townships of Darke County, Ohio, United States. The 2000 census found 1,158 people in the township, 725 of whom lived in the unincorporated portions of the township. Statewide, the only other Allen Townships are located in Hancock, Ottawa, and Union Counties. The first settlers within the bounds of today''s Allen Township were the families of Ephraim and Aaron Ireland. The township was organized in March of 1839 as a split from Brown Township.