53 Pa.C.S. § 3073

The council shall consist of the executive (mayor), who shall be elected at large, and two council members unless pursuant to the authority granted under section 2924 (relating to specificity of recommendations) the municipality is governed by an executive (mayor) and four council members, an executive (mayor) and six council members or an executive (mayor) and eight council members. Members of the council shall be elected at large unless the plan provides that members shall be elected on a district basis in which each district is as equal in population as is feasible or on a combination at-large and district basis as determined by the government study commission or as specified in an initiative petition or ordinance of the governing body under the provisions of sections 2942 (relating to initiation of amendment by electors or council), 2943 (relating to petition for referendum or ordinance proposing amendment) and 2944 (relating to time and manner of submission of question) at a regular municipal election by the voters of the municipality. The members of the council shall serve a term of four years beginning on the first Monday in January next following their election, except as provided in this subpart.