- Consolidated Contracting Services, Inc.
- Consolidated Laboratory Services
- Consulting Engineers and Land Surveyors of California
- Contempory Long Term Care of California
- Continuing Life LLC
- Contra Costa Health Services
- Corazon
- Corbin Willits Systems
- Cordova Bolt Inc.
- Corona Regional Medical Center
- Corona-Norco United Way
- Corporate Express
- Corporate Productions, Inc.
- CorVel Corp.
- County Welfare Directors Association of California
- Courtyard Century City-Beverly Hills, Los Angeles
- Creative Computer Services Incorporated
- Crowne Plaza San Jose, San Jose
- CRW
- Crystal Cream and Butter
- Cvbtv.com-Zephyr Marketing
- Datalabs Worldwide
- Davis Medical Center
- Davita
- DaVita Bakersfield Dialysis Center
- Decca Enterprises
- Delano Regional Medical Center
- Desert Regional Medical Center
- Desert Valley Hospital
- Destination Irvine
- DHHS
- Dignity Health - Mercy General Medical Center
- Dignity Health - Mercy Hospital of Folsom
- Dignity Health - Methodist Hospital of Sacramento
- Dignity Health - Sierra Nevada Memorial Hospital
- Dignity Health - Woodland Memorial Hospital
- District #4
- Doctors Medical Center
- Dodge, Chrysler, Jeep of Vacaville
- Dole Food
- Dominican Hospital
- Donate Life California
- Donor Network West
- DoubleTree by Hilton Hotel Ontario Airport
- DoubleTree by Hilton Hotel San Pedro - Port of Los Angeles
- Downtown Ford Sales
- DST
- Dynarand
- E and M Concrete Construction, Inc.
- Earth Television Network, Inc.