53 Pa. Stat. § 55408
If a new ward is created in a township previously divided into wards and the number of wards in the township, including the new ward, is less than five, then, at the next municipal election following the expiration of the term of the commissioner or commissioners elected at large whose terms shall first expire after the creation of the new ward, there shall be elected, by the registered electors of the new ward, one township commissioner, who shall reside in the ward for which the commissioner is elected, for a term of two or four years, so that the expiration of the commissioner's term will harmonize with the expiration of terms of commissioners for the even or odd numbered wards under the provisions of this act. Successors to the township commissioners shall be elected for terms of four years. The number of commissioners thereafter elected at large in the township shall be the difference between the number of wards and five, and a sufficient number of commissioners shall be elected at large at each municipal election preceding the expiration of terms of commissioners at large so that the total number of commissioners in the township will at all times be five.
If a new ward is created in any township previously divided into wards and the number of wards thereafter in the township is five, then, at the municipal election preceding the expiration of the term of office of any commissioner or commissioners elected at large, a township commissioner shall be elected for the ward, who shall reside in the ward. The election shall be for a two or four year term so that the expiration of the commissioner's term will harmonize with the expiration of terms of commissioners for the even or odd numbered wards under the provisions of this act. The successor to the ward commissioner shall be elected for a four-year term. No township commissioner shall thereafter be elected at large in the township.
If the number of wards in the township, including the new ward, will be more than five, the court of common pleas shall appoint a township commissioner for the new ward, who shall hold office until the first Monday in January succeeding the first municipal election at which township commissioners are elected in the even or odd numbered wards under the provisions of this act, at which election, and every four years thereafter, a township commissioner, who shall reside in the ward, shall be elected by the qualified electors of the ward for a term of four years.
All township commissioners elected under this section shall take office on the first Monday of January next succeeding their election.
53 P.S. § 55408