A structure for Pennsylvania's county governments is laid out in the Pennsylvania Constitution. Under this model, each PA county is governed by three County Commissioners who serve as both executive and legislative roles. Pennsylvania has 67 counties, and most of them are governed this way. 8 counties, including Allegheny County, have adopted Home Rule Charters which allow county voters to decide on a different government structure.
Allegheny County voters approved the adoption of a Home Rule Charter in 1998, and the charter took effect in January of 2000. The charter replaced the county commissioner system defined in the PA Constitution. Allegheny County now has an Executive Branch headed by a County Executive and a Legislative Branch with a 15-member County Council.
Learn more on our Allegheny County Government page.
Read the Allegheny County Home Rule Charter