• Manufacturing companies based in Philadelphia‎ (3 C, 48 P)
• Manufacturing companies based in Pittsburgh‎ (8 C, 27 P)

•

• Motor vehicle assembly plants in Pennsylvania‎ (2 P)

D

• Defunct manufacturing companies based in Pennsylvania‎ (2 C, 59 P)

F

• Firearms manufacturers in Pennsylvania‎ (3 P)

I

• Ironworks and steel mills in Pennsylvania‎ (1 C, 30 P)

M

• Manufacturing companies based in Grantville, Pennsylvania‎ (5 P)
• Motor vehicle manufacturers based in Pennsylvania‎ (1 C, 36 P)

S

• Snack food manufacturers of Pennsylvania‎ (1 C, 9 P)

W

• Westinghouse Electric Company‎ (4 C, 32 P, 1 F)

A

• Acoustic Sheep
• Air Products
• All-Clad
• Allentown Portland Cement Company
• Altoona Works
• Ames True Temper
• Ametek
• Arctic Glacier

B

• Belber
• Birdsboro Steel
• Boeing Rotorcraft Systems
• Bonney Forge Corporation
• Bradford White

C

• Carpenter Technology Corporation
• Center Rock
• CertainTeed
• Channellock
• Charles Beseler Company
• Coherent Corp.
• Conestoga Wood Specialties
• Crayola

D

• Day & Zimmermann
• Day-Timer
• Dickson Manufacturing Company
• Dorman Products
• Double-H Boots

E

• Elliott Company
• Emeco

F

• Fano Guitars

G

• General Glass Industries
• Gentex (military contractor)
• Globus Medical
• Great Coasters International
• Grinnell Mechanical Products
• Griswold Manufacturing

H

• Hale Products Incorporated
• Hanover Shoe
• Hatfield Quality Meats
• Havis, Inc.
• Helios Electric Company
• Hendrick Manufacturing Company
• Herlocher Foods
• Heyl & Patterson Inc.
• Holley Performance Products
• Homestead Steel Works
• Hudson Palmer Homes

J

• Jersey Shore Steel

K

• Keystone (gasoline automobile)
• Knoll, Inc.
• Knox Glass Bottle Company

L

• V. La Rosa and Sons Macaroni Company
• Lycoming Engines

M

• Magnum Research
• Majestic Athletic
• C. F. Martin & Company
• Martin's Potato Chips
• Merchant Shipbuilding Corporation
• Monocoupe Aeroplane and Engine Corporation
• Monocoupe Aircraft
• MOS Technology
• MSA Safety

N

• National Lead Company
• Neuronetics
• New Holland Machine Company
• J. P. Nissen Co

O

• Oliver Iron and Steel Corporation
• Oswalds mill audio

P

• Penn Line Manufacturing
• Penn Lyon Homes
• Pfaltzgraff
• Philco
• Pyrotecnico

Q

• Questar Corporation

S

• S. Morgan Smith
• Schramm Inc.
• Scott Paper Company
• Scranton Button Company
• Standard Steel Car Company

T

• Talon Zipper
• Teleflex
• The Beistle Company
• Triumph Group

V

• Victaulic

W

• W. R. Case & Sons Cutlery Co.
• Werner Co.
• Westinghouse Electric Company
• Woolrich

Y

• York Barbell

Z

• Zambelli Fireworks
• Zippo