I wasn't sure if these locations were truly closed but it seems they are. A few Sonic Drive-Ins are no longer operating in Lancaster County and one location in Berks County was closed last December.
Tanger Outlets Lancaster at 2223 Lincoln Highway in East Lampeter Township, Lancaster County
4247 Oregon Pike in West Earl Township near Ephrata, Lancaster County
855 E. Main St. in Rapho Township near Mount Joy, Lancaster County
4515 Perkiomen Ave., Reading, Berks County
Too bad they all closed. Are there any more?