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| Place Name | County | Place Type | Post Office Dates | More Information |
| Kalamazoo | Decatur | Lost Town | ||
| Kaiser | Greenwood | Lost Town | 1889-1900 | The post office moved from Twin Falls. |
| Kalida | Woodson | Name Change | Now Yates Center. | |
| Kalida, Clifton | Wilson | Lost Town | ||
| Kalloch | Montgomery | Lost Town | Vacated 1901. | |
| Kanawha, Kannaka | Douglas | Lost Town | ||
| Kansapolis | Shawnee | Lost Town | A little east of Indianola. | |
| Kansas Center | Rice | Lost Town | Incorporated by A. Beach and others in 1858. Near Golden City. | |
| Kansas City | Anderson | Lost Town | See Iantha. | |
| Kansas Falls | Geary | Lost Town | Incorporated 1858. | |
| Kaw Agency | Jefferson | Lost Town | North of Lake View. | |
| Kaw City | Jefferson | Lost Town | 1858-1866 | Kaw City was founded in the spring of 1857. |
| Kaw Valley | Wyandotte | Lost Town | Nine miles south of Wyandotte (Kansas City.) | |
| Kearny County | Kearny | Current County | NA | Formed from Finney and Hamilton Counties in 1887. Lakin is the county seat. |
| Kebar | Graham | Lost Town | ||
| Kedron | Osage | Lost Town | ||
| Keefer | Decatur | Lost Town | ||
| Kee-i-tone or Kleitone | Labette | Lost Town | Indian name. It later became Little Town. Now part of Oswego. | |
| Keelville | Cherokee | Lost Town | 1868-1905 | Located in the southwestern corner of the county, 13 miles from Columbus and six miles from Faulkner. In 1910, it had a population of about 45. |
| Keene | Wabaunsee | Lost Town | ||
| Keever | Ellsworth | Lost Town | 1876-1881 | |
| Kegerville | Douglas | Lost Town | ||
| Keimfield | Rush | Lost Town | ||
| Kelley’s Ferry | Doniphan | Lost Place | Established in the 1850s on the Missouri River at the northwest corner of Burr Oak Township. | |
| Kellogg | Cowley | Lost Town | Vacated 1895. | |
| Kelly | Nemaha | Extinct Town | 1888-1988 | Kelly got its start when the Kansas City, Wichita, and Northwestern Railway was built through the area. A beautiful church and several homes still stand. |
| Kelly’s Station | Leavenworth | Name Change | 1866-1867 | The post office moved from Little Stranger. Name change to Fairmount. |
| Kelso | Morris | Lost Town | 1881-1942 | Located on the Neosho River, it was a station on the Missouri-Kansas-Texas Railroad. |
| Kelso | Norton | Lost Town | ||
| Kelso City | Rawlins | Lost Town | Deserted 1879. | |
| Kenamo or Kenemo | Shawnee | Lost Town | Laid out by Joseph Allen, 1856. | |
| Kenbro | Greenwood | Lost Town | 1925-1949 | |
| Kenilworth | Geary | Lost Town | On the east bank of the Republican River, 15 miles above its mouth. Probably a name proposed for the town of Milford. | |
| Kenilworth | Stafford | Lost Town | ||
| Kennebec | Atchison | Lost Town | ||
| Kennebec | Russell | Lost Town | ||
| Kennedy | Dickinson | Lost Town | ||
| Kennekuk | Atchison | Lost Town | 1857-1900 | Kennekuk was one of the first places in the county where whites located permanently when a Methodist Episcopal Church Mission was established in 1833 among the Kickapoo tribe. |
| Kenneth/Mastin/Newington | Johnson | Lost Town | 1890-1943 | Today, Kenneth is part of Overland Park. |
| Kenneth | Rooks | Lost Town | ||
| Kenneth | Sheridan | Lost Town | 1877 | Located in 1877; abandoned 1886; vacated 1901. |
| Kent | Geary | Lost Town | ||
| Kent | Reno | Lost Town | Vacated 1889. | |
| Kenton | Geary | Lost Town | Near the mouth of the Humboldt Creek. | |
| Kenton | Greenwood | Lost Town | 1872-1879 | The post office moved to Verdigris Falls. |
| Keokuk | Linn | Lost Town | ||
| Kepferle | Cheyenne | Lost Town | ||
| Kepple | Wichita | Lost Town | ||
| Key | Cloud | Lost Town | ||
| Key West | Coffey | Lost Town | ||
| Keystone | Dickinson | Lost Town | ||
| Keysville | Pawnee | Lost Town | ||
| Kickapoo/Kickapoo City | Leavenworth | Lost Town | 1855-1920 | Kickapoo, one of the oldest towns in Leavenworth County, was first called Kickapoo City. |
| Kickapoo Mission | Atchison | Lost Town | ||
| Kildare | Phillips | Lost Town | ||
| Kimball | Atchison | Name Change | Name changed to Larkin. | |
| King City | McPherson | Lost Town | P.O. in 1872. | |
| Kingman County | Kingman | Current County | NA | Formed from Harper and Reno Counties in 1872. Kingman is the county seat. |
| Kingston | Labette | Lost Town | ||
| Kinney’s Station | Osage | Lost Town | Near Ridgeway. | |
| Kiowa County | Kiowa | Current County | NA | Formed from Comanche and Edwards Counties in 1886. Greensburg is the county seat. |
| Kirkfield | Edwards | Lost Town | ||
| Kirkwood | Crawford | Lost Town | NA | A coal mining camp. |
| Kitley | Sumner | Lost Town | ||
| Knauston | Finney | Lost Town | Vacated 1893. | |
| Kniveton | Cherokee | Lost Town | 1895-1902 | Located on the Kansas City Southern Railroad 15 miles northeast of Columbus. |
| Knowles | Washington | Lost Town | Name changed to Haddam, in 1885. | |
| Kosciusko | Riley | Lost Town | Projected town six miles east of Manhattan. | |
| Kossuth | Butler | Lost Town | Chartered 1858. | |
| Kossuth | Linn | Lost Town | 1893-1905 | |
| Kossuth | Pottawatomie | Lost Town | ||
| Kristof | Trego | Name Change | 1904 | The post office moved and the name changed to Voda. |
| Kunkel’s Ferry | Douglas | Lost Place | Established in 1857 on the Kansas River between Lecompton and Rising Sun. Jerome Kunkel, proprietor. | |
| Kuykendall’s Ferry | Jackson | Lost Place | On the Kansas River at Calhoun. James Kuykendall, Proprietor. Calhoun was the first county seat of Jackson County. | |
| Kuykendall’s Ferry | Wyandotte | Lost Place | Established in 1853 on the Missouri River at Parkville, Missouri. James Kuykendall, proprietor. |