53 Pa. Stat. § 55407
When a township is first divided into wards, the township commissioners then in office shall continue in office until the expiration of their respective terms.
At the first municipal election occurring at least 90 days after the division into wards, there shall be elected, by the registered electors of each ward of the township, one township commissioner, who shall reside in the ward for which the commissioner is elected. At the election, the township commissioners elected in even-numbered wards shall be elected for terms of two years each, and those in odd-numbered wards for terms of four years each, or vice versa, as the case may be, in order that the expiration of the terms will harmonize with the expiration of terms of township commissioners elected for the even or odd numbered wards under the provisions of this act. Thereafter, successors to the commissioners shall be elected for terms of four years each at the municipal election immediately preceding the expiration of the terms of ward commissioners.
If the number of wards into which the township has been divided is less than five, then, at the municipal election preceding the expiration of the terms of any commissioner or commissioners elected at large, if the expiration of terms will leave the township with less than five township commissioners, there shall be elected at large a sufficient number of township commissioners so that the total number of commissioners elected by wards and at large in the township shall thereafter be five. If one township commissioner is elected at large, the commissioner shall be elected for a term of four years. If two township commissioners are elected at large, one shall be elected for a term of two years, and one for a term of four years. If three township commissioners are elected at large, two shall be elected for terms of four years each, and one for a term of two years. Successors to the township commissioners elected at large shall be elected for terms of four years each.
All terms of office of township commissioners, elected at large or by wards, shall commence on the first Monday of January next following their election.
53 P.S. § 55407