- Marriott San Francisco Fisherman's Wharf
- Marriott San Mateo San Francisco Airport
- Marshall Medical Center
- Martin Luther King Jr. Community Hospital
- Martin Luther King, Jr. Community Hospital
- Mattel
- MBIA
- Medtronic
- Memorial Care Orange Coast Medical Center
- Memorial Hospital - Bakersfield
- Memorial Hospital of Gardena
- Memorial Medical Center Modesto
- MemorialCare Saddleback Medical Center
- Menifee Valley Medical Center
- Mercy General Hospital
- Mercy Hospital Downtown
- Mercy Hospital of Folsom
- Mercy Hospital Southwest - Bakersfield
- Mercy Hospitals of Bakersfield
- Mercy Medical Center - Redding Guild
- Mercy Medical Center Redding
- Mercy Merced Medical Center
- Mercy San Juan Medical Center
- MET - West
- Methodist Hospital
- Methodist Hospital of Southern California
- MetLife Financial Services
- Miller Children's and Women's Hospital Long Beach
- Mills Peninsula Medical Center
- Miss Mendocino County Pageant
- Mission Community Hospital
- Mission Hospital Laguna Beach
- Mission Hospital Mission Viejo
- ML Sewing Machine Company
- Modesto Junior College
- Molina Healthcare, Inc.
- Montclair Medical Center
- Monterey Bay Inn
- Monterey County Convention and Visitors Bureau
- Monterey County Convention and Visitors Bureau
- Monterey County Coroner's and Sherriff's Office
- Monterey Marriott
- Monterey Park Hospital
- Moriah Consultants
- Motor City Auto Center - Bakersfield
- Mountain Pacific Association of Colleges and Employers
- Mountains Community Hospital
- Multistate Associates Incorporated
- National Education Association
- National Federation of Asian American United Methodists