K
- Kahana Bay (1)
- Kaibab National Forest (8)
- Kaibab Plateau (1)
- Kailua Bay (1)
- Kalamazoo Lake (1)
- Kalmia (1)
- Kames (1)
- Kanab Canyon (1)
- Kanab Creek (5)
- Kanaka Bay (2)
- Kanawha River (1)
- Kanenelu Bay (1)
- Kaneohe Bay (5)
- Kapowsin Camp (6)
- Kaskaskia Canyon (1)
- Keiser (1)
- Kelps (1)
- Kelsey City (1)
- Keokuk Dam (2)
- Keokuk Power Plant (1)
- Keweenaw Peninsula (14)
- Kiawe (2)
- Kilauea Crater (4)
- King Solomons Seal (1)
- King, Mrs. (1)
- Kings Canyon National Park (1)
- Kingston Peak (2)
- Knob Cone Pine (1)
- Knotted Spike Rush (1)
- Koa (1)
- Kochia (1)
- Koeleria cristata (1)
- Koko Head (3)
- Kootenai Mountain (1)
- Kraus, E. J. (Ezra Jacob), 1885-1960 (1)