The township of Sadsbury was organized in 1717. In 1728, it was divided into West Sadsbury Township and East Sadsbury Township. East Sadsbury Township was reduced in size by the creation of Valley Township in 1852, the borough of Parkesburg in 1872 and the borough of Atglen in 1875. The final division came with the inception of West Sadsbury in 1878, with the remainder being Sadsbury Township in its current form.
