Hi Donna, From the book, History of Perry Co. PA; Hain: "The present town of Duncannon was long known as Petersburg (being incorporated as Petersburg Borough in 1844), and the adjoining village of Lower Duncannon, lying between Juniata and Sherman's Creek, was known as Duncannon. Petersburg only extended to Ann Stret, Dr. Ebert owning the field lying north of that. The original borough only extended from Juniata Creek to an alley, where the present electric light plant is locaed but in 1900 it was extended to include the western end, which had been known as Baskinville and the Carver's Hill section, both of which bear the name of pioneers." "In 1865 the name was changed to Duncannon..." Hope that helps some, Cathy