Constitution of the Commonwealth of Pennsylvania Art. IX, § 4. County government

County officers shall consist of commissioners, controllers or auditors, district attorneys, public defenders, treasurers, sheriffs, registers of wills, recorders of deeds, prothonotaries, clerks of the courts, and such others as may from time to time be provided by law.

County officers, except for public defenders who shall be appointed as shall be provided by law, shall be elected at the municipal elections and shall hold their offices for the term of four years, beginning on the first Monday of January next after their election, and until their successors shall be duly qualified;  all vacancies shall be filled in such a manner as may be provided by law.

County officers shall be paid only by salary as provided by law for services performed for the county or any other governmental unit.  Fees incidental to the conduct of any county office shall be payable directly to the county or the Commonwealth, or as otherwise provided by law.

Three county commissioners shall be elected in each county.  In the election of these officers each qualified elector shall vote for no more than two persons, and the three persons receiving the highest number of votes shall be elected.

Provisions for county government in this section shall apply to every county except a county which has adopted a home rule charter or an optional form of government.  One of the optional forms of county government provided by law shall include the provisions of this section.