Según el censo de 2000,[2]​ habían 1,281,666 personas, 537,150 hogares y 332,495 familias residiendo en la localidad.

Había 583,646 viviendas con una densidad media de 309 viviendas/km².

El 84.33% de los habitantes eran blancos, el 12.41% afroamericanos, el 0.12% amerindios, el 1.69% asiáticos, el 0.03% isleños del Pacífico, el 0.34% de otras razas y el 0.07% pertenecía a dos o más razas.

Clairton | Duquesne | McKeesport | Pittsburgh Aspinwall | Avalon | Baldwin | Bell Acres | Bellevue | Ben Avon | Ben Avon Heights | Bethel Park | Blawnox | Brackenridge | Braddock | Braddock Hills | Bradford Woods | Brentwood | Bridgeville | Carnegie | Castle Shannon | Chalfant | Cheswick | Churchill | Coraopolis | Crafton | Dormont | Dravosburg | East McKeesport | East Pittsburgh | Edgewood | Edgeworth | Elizabeth | Emsworth | Etna | Forest Hills | Fox Chapel | Franklin Park | Glassport | Glen Osborne | Glenfield | Green Tree | Haysville | Heidelberg | Homestead | Ingram | Jefferson Hills | Leetsdale | Liberty | Lincoln | McDonald‡ | McKees Rocks | Millvale | Monroeville | Mount Oliver | Munhall | North Braddock | Oakdale | Oakmont | Pennsbury Village | Pitcairn | Pleasant Hills | Plum | Port Vue | Rankin | Rosslyn Farms | Sewickley | Sewickley Heights | Sewickley Hills | Sharpsburg | Springdale | Swissvale | Tarentum | Thornburg | Trafford‡ | Turtle Creek | Verona | Versailles | Wall | West Elizabeth | West Homestead | West Mifflin | West View | Whitaker | White Oak | Whitehall | Wilkinsburg | Wilmerding Aleppo | Baldwin | Collier | Crescent | East Deer | Elizabeth | Fawn | Findlay | Forward | Frazer | Hampton | Harmar | Harrison | Indiana | Kennedy | Kilbuck | Leet | Marshall | McCandless | Moon | Mt. Lebanon | Neville | North Fayette | North Versailles | O'Hara | Ohio | Penn Hills | Pine | Reserve | Richland | Robinson | Ross | Scott | Shaler | South Fayette | South Park | South Versailles | Springdale | Stowe | Upper St.

Clair | West Deer | Wilkins Allison Park | Bairdford | Bakerstown | Carnot-Moon | Curtisville | Enlow | Glenshaw | Greenock | Harwick | Imperial-Enlow (histórico) | Imperial | Noblestown | Russellton | South Park | Sturgeon | Sturgeon-Noblestown (histórico) Acmetonia | Blanchard | Broughton | Bruceton | Buena Vista | Clinton | Creighton | Dorseyville | Gibsonia‡ | Harmarville | Hickory Heights | Karns | Keown Station | Natrona | Natrona Heights | Rennerdale | Warrendale | Wexford | Wildwood