1850 Atlas
| Name | What | Place | Pop | Other |
| Kiomatia | PO | Red River Co, TX | ||
| Kirby | T | Caledonia Co, VT | 509 | water by Moose river |
| Kirby | PO | Greene Co, PA | ||
| Kirkersville | PV | Harrison twp, Licking Co, OH | ||
| Kirkland | PT | Penobscot Co, ME | 2,108 | water by streams flowing in to Puchan lake |
| Kirkland | PT | Oneida Co, NY | 3,421 | water by Oriskang creek |
| Kirkland | PO | Cabarras Co, NC | ||
| Kirk's Cross Roads | PO | Clinton Co, IN | ||
| Kirk's Ferry | PO | Tensas parish, LA | ||
| Kirk's Mills | PO | Lancaster Co, PA | ||
| Kirksey's Cross Roads | not listed | Edgefield dist, SC | ||
| Kirksville | PO | Madison Co, KY | ||
| Kirksville | PV, CH | Adair Co, MO | seat of justice | |
| Kirkville | PV | Butler Co, AL | ||
| Kirkville | PV | Manlius twp, Onondaga Co, NY | ||
| Kirkville | PO | Wapello Co, IA | ||
| Kirkwood | T | Belmont Co, OH | ||
| Kirkwood | PO | Broome Co, NY | ||
| Kirtland | PT | Lake Co, OH | 1,598 | |
| Kishacoquillas | PO | Mifflin Co, PA | ||
| Kishwaukie | PV | Winnebago Co, IL | ||
| Kiskatom | PO | Greene Co, NY | ||
| Kiskiminitas | PT | Armstrong Co, PA | 2,430 | water by Connemaugh river & Pennsylvania canal |
| Kitching's Mills | PO | Orangeburgh dist, SC | ||
| Kitnaning | PB, CH | Armstrong Co, PA | seat of justice, water by Alleghany river | |
| Kittaning | PT | Armstrong Co, PA | 1,175 | |
| Kittery | PT | York Co, ME | 2,706 | water by Piscataqua river & Atlantic ocean |
| Klecknersville | PO | Northampton Co, PA | ||
| Klinesville | PO | Berks Co, PA | ||
| Klinesville | PO | Hunterdon Co, NJ | ||
| Klingerstown | PO | Schuylkill Co, PA | ||
| Klinterbish | PO | Sumter Co, AL | ||
| Klutt's Tan Yard | PO | Catarras Co, NC | ||
| Knap of Reed's | PO | Granville Co, NC | ||
| Knap's | PO | Carter Co, KY | ||
| Knight's Ferry | PO | San Joaquin Co, CA | ||
| Knightstown | PV | Henry Co, IN | water by Blue river | |
| Knightsville | PO | Providence Co, RI | ||
| Knob | PO | Tazewell Co, VA | ||
| Knob Creek | PO | Harrison Co, IN | ||
| Knob Fork | PO | Wetzel Co, VA | ||
| Knobnoster | PO | Johnson Co, MO | ||
| Knottsville | PO | Daviess Co, KY | ||
| Knowersville | PO | Albany Co, NY | ||
| Knowlesville | PV | Ridgeway twp, Orleans Co, NY | on the Erie canal | |
| Knowlton | PT | Warren Co, NJ | 1,356 | water by Shawpocussing creek, Paulin's kill & Beaver brook |
| Knox | PT | Waldo Co, ME | ||
| Knox | PT | Albany Co, NY | 2,021 | water by Bozrah kill |
| Knox | PO | Middlebury twp, Knox Co, OH | ||
| Knox | T | Columbiana Co, OH | 2,155 | water by Mahoning creek |
| Knox | T | Guernsey Co, OH | 755 | |
| Knox | T | Holmes Co, OH | 1,210 | |
| Knox | T | Jefferson Co, OH | 1,902 | |
| Knox | PO | Stark Co, IN | ||
| Knox Centre | PO | Knox twp, Waldo Co, ME | ||
| Knox Corners | PO | Oneida Co, NY | ||
| Knoxville | PO | Greene Co, AL | ||
| Knoxville | City, CH | Knox Co, TN | 2,076 | seat of justice, water by Holston river, seat of Tennessee college |
| Knoxville | PO | Tioga Co, PA | ||
| Knoxville | V | Frederick Co, MD | ||
| Knoxville | PV | Knox twp, Jefferson Co, OH | ||
| Knoxville | PV | Crawford Co, GA | seat of justice | |
| Knoxville | PV, CH | Knox Co, IL | seat of justice | |
| Knoxville | PO | Franklin Co, MS | ||
| Knoxville | PO | Marion Co, IA | ||
| Knoxville | PV | Ray Co, MO | ||
| Kokomo | PO | Howard Co, IN | ||
| Koro | PO | Winnebago Co, WI | ||
| Kortright | PT | Delaware Co, NY | 2,181 | water by Delaware river |
| Kosciusko | PV, CH | Attala Co, MS | seat of justice, water by Yockonockony river | |
| Koskonong | PO | Jefferson Co, WI | ||
| Kossuth | PO | Des Moines Co, IA | ||
| Kossuth | PO | Racine Co, WI | ||
| Kossuth | PO | Boone Co, IL | ||
| Kossuth | PO | Auglaize Co, OH | ||
| Kossuth | PO | Washington Co, IN | ||
| Kossuth | PO | Washington Co, ME | ||
| Kossuth | PO | Cherokee Co, GA | ||
| Kossuth | PO | Clarion Co, PA | ||
| Kowaliga | PO | Tallapoosa Co, AL | ||
| Kratzersville | PO | Union Co, PA | ||
| Kreidersville | PV | Northampton Co, PA | water by Hockendocque creek | |
| Kresgeville | PO | Monroe Co, PA | ||
| Kroh's Mills | PO | Carroll Co, MD | ||
| Kuler | T | Van Buren Co, MI | 433 | |
| Kulpsville | PO | Montgomery Co, PA | ||
| Kunkletown | PO | Monroe Co, PA | ||
| Kutztown | PB | Maxatawny twp, Berks Co, PA | 640 | water by branch of Maiden's creek |
| Kyger | PO | Gallia Co, OH | ||
| Kyserike | PO | Rochester twp, Ulster Co, NY | ||
| Kyte River | PO | Ogle Co, IL |