Thornbury Township was organized in 1687 with the appointment of Hugh Durborrow as constable and received its name from Thornbury, in Gloucestershire, England. At the time, no more than five or six families lived within the limits of the township. George Peirce, one of the earliest and most influential inhabitants of the township, was married to a native of Thornbury, England, and the township was purportedly named to compliment her. Thornbury, Birmingham and Westtown townships are the only townships within the present limits of Chester County which were organized before 1704.