The Thornton National Register Historic District is in Thornbury Township. It includes the “Yellow House” built by John King in the early 1800s. The building became a post office in 1832 and is one of the oldest post offices in its original space. Other historic houses in the district are wood frame or stone. In all, there are 195 historic structures in Thornbury Township. A railroad station was built in Glen Mills in 1882 and increased the economic growth of Thornbury Township as products from the mills and nail factories were taken to Philadelphia and much needed items were brought to the township. In the twentieth century, the mills began to close. Farming continued until the 1970s and a quarry opened in the township. Railroad service ended in Thornbury Township but the township’s location brought people who wanted to live in an area of less congestion with plenty of open space.

Delaware County is made up of 49 municipalities. It is located in the southeastern corner of Pennsylvania and covers 184 square miles. There are 12 colleges and universities in the county, and eight hospitals. There are four large county parks in Delaware County: Clayton Park, Rose Tree Park, Smedley Park, and Upland Park. Clayton Park covers 170 acres and has a 9-hole golf course. It is the largest county park and features ball fields, picnic areas, a beech and maple forest, and walking trails. Rose Tree Park has a nature trail, gazebo, historical buildings, picnic areas and an amphitheater stage on 120 acres. Smedley Park, at 120 acres, features hiking areas, ball fields and an Environmental Center for master gardeners, horticulture agents and 4-H Clubs. Upland Park offers picnic areas, a playground, woodland areas for walking, and ball fields on 60 acres. The Redwood Community Theater is located here, and a recreation program offers arts and crafts classes and sports.