- 2 Pillars
- 3 Pilling's Print & Dye Works
- 11 Pillows
- 3 Pills
- 1 Pillsbury, Charles A., & Co.
- 1 Pilot boats
- 1 Pim Brothers & Co.
- 1 Pin industry
- 1 Pinch, Miss Ruth (Fictitious character)
- 7 Pinchot, Gifford, 1865-1946
- 1 Pine cones
- 31 Pine Street
- 1 Pine Street Market
- 1 Pine Street Presbyterian Church
- 1 Pine, Robert Edge, 1720-1788
- 2 Pines
- 1 Pinkney, William, 1764 - 1822
- 6 Pins (fasteners)
- 2 Pioneer Suspender Co. (Firm)
- 1 Pioneers
- 1 Piper, Reverend Henry Hunt
- 2 Piper's Mill
- 6 Pipes (Conduits)
- 7 Pipes (Musical instruments)
- 5 Pipes (smoking equipment)
- 4 Piracy (forgery)
- 9 Pirates
- 4 Pisces symbols
- 6 Pistols
- 1 Pitcairn Islands
- 1 Pitcairn Islands
- 1 Pitcairn, John, 1722–1775
- 2 Pitch (tar)
- 1 Pitched-brick vaults
- 13 Pitchers
- 8 Pitchforks
- 1 Pits (earthworks)
- 1 Pitt, William, 1759-1806
- 14 Pittsburgh, Pennsylvania
- 1 Pittsfield, Massachusetts
