| Keyes Fibre | Hammond | IN |
| Key Largo Inn | Fort Wayne | IN |
| Kieffer Paper Mills | Ewing | IN |
| Kimble Glass | Muncie | IN |
| Kingan & Company | Indianapolis | IN |
| Kingan Meat Processing | Indianapolis | IN |
| Kingsbury | Peru | IN |
| Kingsbury Ordnance Plant | La Porte | IN |
| Kingsford Packing | Fort Wayne | IN |
| Kingsley Furniture | La Porte | IN |
| Kingston Products | Kokomo | IN |
| Kinsterstate Industries | Michigan City | IN |
| Kirk & Blum | Indianapolis | IN |
| Kitchen Maid | Andrews | IN |
| Kmart | Terre Haute | IN |
| Kmart | Indianapolis | IN |
| Knerr Board & Paper | Kokomo | IN |
| Knight Brinkerhoff Piano | Brazil | IN |
| Knightstown Water & Light | Kokomo | IN |
| Koch Enterprises | Evansville | IN |
| Koch George & Sons | Evansville | IN |
| Kokomo Casting Plant | Kokomo | IN |
| Kokomo Die Casting | Kokomo | IN |
| Kokomo Foundry | Kokomo | IN |
| Kokomo, Marion, & Western Traction | Kokomo | IN |
| Kokomo Public Schools | Kokomo | IN |
| Kokomo Tube | Peru | IN |
| Koppers | East Chicago | IN |
| Kraft Food | Sheridan | IN |
| Kraus Sheet Metal | Fort Wayne | IN |
| Krell Auto Grand Piano | Connersville | IN |
| Krell French Piano | New Castle | IN |
| Kresge Department Store | Indianapolis | IN |
| Kroger | Fort Wayne | IN |
| Kroger | Indianapolis | IN |
| Kroger | Terre Haute | IN |
| Kruse & Dewentel | Indianapolis | IN |
| Labour/Taber Pump | Elkhart | IN |
| Lafayette Boy Board | Lafayette | IN |
| Lafayette Car Works | Lafayette | IN |
| Lafayette Coal | Clinton | IN |
| Lafayette Gas | Lafayette | IN |
| Lafayette Home Hospital | Lafayette | IN |
| Lafayette Refrigeration Service | Lafayette | IN |
| Lafayette Street Railway | Lafayette | IN |
| Lafayette U.S. Air Force | Lafayette | IN |
| Lake Cities Electric Railway | Michigan City | IN |
| Lake Shore & Michigan Southern Railway | Elkhart | IN |
| Lakeside Junior High School | Fort Wayne | IN |
| Lake Steel Chair | Huntington | IN |
