- Mid-America Transplant Services
- Mid-Atlantic Renal Coalition
- Mid-Minnesota Family Practice Center
- Mid-South Gastroenterology Group-Bowden Surgery Center
- Mid-South Tissue Bank
- Mid-South Transplant Foundation
- Mid-State Health Center
- Mid-States Aluminum Corp
- Mid-States Aluminum Corporation
- Midcoast Energy Resources Inc., Transportation Group
- Middle East Institute
- Middlesboro ARH Hospital
- Middlesex Hospital
- Middlesex United Way
- Midhudson Regional Hospital of Westchester Medical Center
- Midlands, LLC
- Midstate Medical Center
- Midstates Bank, NA
- Midtown Community Health Center
- Midvale Boys and Girls Club
- Midvale Police Department
- Midway Chevorlet
- Midwest Bank Note Company
- Midwest Kidney Network
- Midwest One Financial Group
- Midwest Orthopedic and Specialty Hospital
- Midwest Physical Therapy and Sports Center
- Midwest Regional Medical Center
- Midwest Society of Association Executives
- Midwest Stamping and Manufacturing Inc.
- Midwest Transplant Network
- Midwestern University
- MIEMSS Maryland Institute for EMSS)
- Migrant Health Service
- Mike O'Callaghan Military Medical Center
- Mike's American Grill, Springfield, VA
- Milam and Company Painting, Inc.
- Mile High United Way, Inc.
- Miles College
- Miles Media Group, Inc.
- Miles-McClellan
- Milford Area United Way
- Milford Regional Medical Center
- Military Officers Association
- Military Operations Research Society
- Military Sealift Command
- Milk Co., Inc.
- Millard Fillmore Suburban Hospital
- MillCraft Group
- Millcreek Community Hospital