The original Lower St. Clair Township consisted of the present-day neighborhoods of the City of Pittsburgh south of the Monongahela and Ohio, and all or parts of Green Tree, Carnegie, Baldwin, Bridgeville, Dormont, Mount Lebanon and other boroughs and townships in the South Hills.
The initial Lower St. Clair Township comprised the present-day neighborhoods of the City of Pittsburgh south of the Monongahela and Ohio, and parts or all of Green Tree, Carnegie, Baldwin, Bridgeville, Dormont, Mount Lebanon, and other municipalities in the South Hills.