- 6 Kiralfy, Bolossy, d. 1932, Architect
- 4 Kiralfy, Imre, 1845-1919, Architect
- 1 Kirby-Smith, Edmund, 1824-1893
- 2 Kirk, Chester Hughes, Architect
- 1 Kirkbride's Hospital see Pennsylvania Hospital for the Insane
- 1 Kirkland Cotton & Woolen Mills
- 3 Kirn, Herman.
- 3 Kiryu Kosho Kuwaisha
- 5 Kissing
- 2 Kitchen Lane
- 1 Kitchenman Carpet Factory
- 1 Kitchenman Dye Works & Woolen Mill
- 11 Kitchens
- 7 Kites (Toys)
- 2 Kitsch's Hotel
- 1 Kitson Machine Co.
- 1 Kittaning Coal Co.
- 12 Kittens
- 1 Kiwis
- 1 Klauder's Flour Mill
- 1 Kline Brothers Notaries Public (firm)
- 1 Kline, George & Wells, Samuel Brick Yard
- 2 Knap Hill Nursery
- 1 Knapp's Barrel Organ Factory
- 1 Knapsacks
- 1 Kneass, Strickland, 1821-1884
- 15 Knee-Hi
- 8 Kneeling
- 1 Knickerbocker Ice Company
- 1 Knight, Edward C. (Edward Collings), 1813-1892
- 1 Knight, J. P.
- 8 Knights (landholders)
- 1 Knight's Mill
- 9 Knights Road
- 1 Knights Templar Parade
- 3 Knitting
- 17 Knives
- 1 Knocking
- 7 Knorr Street
- 4 Knots (motifs)
