In a message dated 1/16/2006 4:12:35 A.M. Mountain Standard Time, CougarToys@aol.com writes: I believe that in 1848. Oxford Township, Chester County might still have been part of Philadelphia County. You'd have to look and see when they split up the counties. There were three original counties in Pennsylvania. They were Philadelphia, Bucks and Chester. None were broken off from each other.