- Kickapoo Nation16
- Kickapoo Tribe of Nation7
- Kickapoo Tribe of Oklahoma15
- Kiowa Indian Tribe of Oklahoma22
- Kiowa Tribe of Oklahoma142
- Kiowa Tribe of Oklahoma of Oklahoma46
- Kloppenburg Switzer and Teich, Inc.1
- Knight and Company2
- Kopper Associates1
- LTS Advertising Services1
- Labor Strategies, Inc.5
- Laguens, Hamburger and Stone2
- Lenape Nation1
- Loomis, Inc.1
- Lynn Hinkle1
- MCSSR15
- MacWilliams, Cosgrove, Snider, Smith and Robinson3
- MacWilliams, Robinson and Partners4
- Macwilliams, Cosgrove, Smith and Robinson2
- Magnolia Broadcast Monitoring Service1
