Bala Cynwyd is a community and census-designated place in Lower Merion Township, Pennsylvania, United States. It is located on the Philadelphia Main Line in Southeastern Pennsylvania and borders the western edge of Philadelphia at U.S. Route 1. The present-day community was originally two separate towns, Bala and Cynwyd, but was united as a singular community largely because the U.S. Post Office, the Bala Cynwyd branch, served both towns using ZIP Code 19004.