Wynnewood is a city located in Garvin County, Oklahoma.  There is also a Wynnewood, PA. The railroad workers were from Pennsylvania and named the existing townsites what they wanted. They also named Paoli and Ardmore, Oklahoma after towns in Pennsylvania. Wynnewood was known as "Walner" before that happened.  The original townsite was a rock bottom crossing on the Washita river called Cherokee Crossing.  People of note born in Wynnewood include musician Roy Milton, General Tommy Franks, who commanded the invasion forces of Operation Enduring Freedom in Afghanistan and Operation Iraqi Freedom in Iraq, and Donna Shirley, who led the Mars Pathfinder project at Jet Propulsion Lab.