- Contract Resource Group Inc.
- Cook Children's Medical Center
- Cooke County United Way
- Corlex International Inc.
- Corpus Christi Padre Island Convention and Visitors Bureau
- Corsicana-Navarro County Chamber of Commerce
- Cotton Restoration Inc.
- Country Clipper Salon
- Courtyard by Marriott, Abilene
- Courtyard Houston Brookhollow
- Courtyard Houston-Near the Galleria
- Covenant Children's Hospital
- Covenant Medical Center
- Cox Radio
- Crowne Plaza Houston, Brook Hollow
- Cy-Fair Houston Chamber of Commerce
- D. Anderson and Company
- Dallam-Hartley Counties United Way, Inc.
- Dallas County Medical Society
- Dallas Nephrology Associates
- Dallas Nephrology Associates
- Dallas-Ft. Worth Airport Marriott South
- Data Solutions Corporation
- DataCert
- David E. Otwell Company Inc.
- Davila Plumbing and Construction
- Daystar
- Dayton Masonic Lodge No. 825 A.F. and A.M.
- De La Rosa Pharmacy
- Deerbrook Forest Chrysler-Jeep
- Dell Children's Medical Center of Central Texas
- Dell Seton Medical Center at the University of Texas
- DermResearch, Inc.
- DHR Health
- DHR Health Transplant Institute
- DHR Transplant Institute
- Doctor's Hospital at Renaissance
- Doctors Hospital of Laredo
- Docucon Imaging Services
- Donate Life Texas
- Donny Wright Sings
- Dooley Elementary
- Doral Tesoro Hotel and Golf Club - Alliance, Fort Worth
- Doubletree Hotel, Austin
- Dr. Keith Delahoussaye, D.C. FIAMA
- Durez Corporation
- Dynegy
- Dyonyx
- East Loop Chiropractic Clinic Inc.
- East Texas Health Access Network