- 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)
- 3 Knowledge
- 1 Knowles, James Sheridan, 1784-1862
- 2 Knowles, John, 1810 or 1811-1880
- 1 Knox Street
- 1 Knoxville, Tennessee
- 2 Koberger, Anton, approximately 1440-1513
- 1 Koch & Bein
- 2 Kohler & Frohling
- 2 Kokomo, Indiana
- 4 Kolb, G. & W. Fire Brick Works
- 1 Kolle, Ann
- 4 Kolle, Henry William
- 7 Kollner, Augustus, b. 1813
- 1 Kolskiy Poluostrov, Russia
- 2 Kongsberg Solvverk
- 2 Kongsberg, Norway
