| Surname | Township |
| Kapple | Ward 2 |
| Kappleman | Union |
| Karaker | Hurricane |
| Karnes | Union |
| Kasper | Mainshore, Spring Grove |
| Kauble | Union |
| Keefe | Ward 2 |
| Keeler | Clarke |
| Keeting | Ward 3 |
| Keistler | Friendship |
| Kelley | Hurricane, Union, Ward 2 |
| Kellogg | Lake |
| Kelly | Friendship, Jones, Spring Grove, Ward 1 |
| Kenedy | Hurricane, Union |
| Kenimer | Jones |
| Kennedy | Cache, Hurricane, Ward 3 |
| Kennemore | Cache, Jones |
| Kennemorie | Cache |
| Kerchoff | Ward 3 |
| Kern | Ward 2 |
| Kerr | Ward 2 |
| Key | Cache, Salem |
| Keys | Union |
| Kibler | Mainshore |
| Kidwell | Shady Grove |
| Kielschinske | Union |
| Kilgore | Spring Grove |
| Kimbrough | Clarke, Ward 1 |
| King | Cache, Clarke, Crowley, Hurricane, |
| King | St. Francis, Union, Ward 1, Ward 2 |
| Kingston | Mainshore |
| Kinn | Mainshore |
| Kinning | Mainshore |
| Kirby | Cache, Friendship, Union, Ward 2 |
| Kirkpatrick | Mainshore |
| Kitchens | Ward 1 |
| Kizer | Salem |
| Klatz | Union |
| Kleins | Poland |
| Knight | Bryan, Hurricane, Mainshore, Salem, Shady Grove |
| Knight | Spring Grove, Union, Ward 1, Ward 2 |
| Knox | Friendship, Ward 1 |
| Koonce | Union |
| Krantz | Ward 1 |
| Kueter | Mainshore, Spring Grove |
| Kuether | Mainshore |
| Kuykendall | Cache, Hurricane, Ward 3 |
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