53 Pa.C.S. § 723

All election districts in the impacted territory shall remain as constituted prior to the boundary change and shall become election districts of the municipality gaining territory on the change in designation in accordance with the act of June 3, 1937 (P.L.1333, No.320), known as the Pennsylvania Election Code. All election district officers shall continue in office until the expiration of the officer's term, unless the office is vacated.