| Wycoff Steel | Ambridge | PA |
| Wyeth Laboratories | Paoli | PA |
| Wyeth Laboratories | Philadelphia | PA |
| Wyeth Laboratories | Malvern | PA |
| Wyeth Laboratories | West Chester | PA |
| Wyoming Avenue & G Street | Philadelphia | PA |
| Y-Auditorium, State Correctional Institution | Waymart | PA |
| Yewdall & Jones Brothers | Philadelphia | PA |
| YMCA | Reading | PA |
| YMCA | Lancaster | PA |
| YMCA | Pottstown | PA |
| YMCA | Bethlehem | PA |
| YMCA | Philadelphia | PA |
| YMCA | Lansdale | PA |
| Yoder Industries | York | PA |
| York Corrugating | York | PA |
| York County Courthouse | York | PA |
| York Hospital | York | PA |
| York International | York | PA |
| York Junior College | York | PA |
| York Manufacturing | York | PA |
| York Shipley | York | PA |
| Yorktowne Hotel | York | PA |
| York Water | York | PA |
| Young Door | Sunbury | PA |
| Young Everett | Kinzers | PA |
| Youngstown Sheet & Tube | McKees Rocks | PA |
| Youngstown Sheet & Tube | Coraopolis | PA |
| Zabel Bros. | Philadelphia | PA |
| Zack Industries | Reading | PA |
| Zausner Foods | New Holland | PA |
| Zedmark | Valencia | PA |
| Zenith | Lansdale | PA |
| Zenith Manufacturing Plant | North Wales | PA |
| Zinc Smelting Division | Monaca | PA |
| Zinman Furs | Philadelphia | PA |
| Zion Industries | Bradford | PA |
| Zion Lutheran Church | Penbrook | PA |
| Z & L Lumber | Burgettstown | PA |
| Z & L Lumber | Mercer | PA |
| Z & L Lumber | Sharpsburg | PA |
| Zonolite | New Castle | PA |
| Zug Iron & Steel | Pittsburgh | PA |
| Zurn Industries | Erie | PA |
