- Mark Kamin and Associates, Inc - Houston, TX
- Mark Kamin and Associates, Inc - Palo Alto
- Mark Sofman
- Mark Twain Medical Center
- Mark W. Dixion, CMT, BCTMB
- Markel Corporation
- Marken
- Marker International
- Marketing Ally
- Marketing Business Services and Event Planners
- Marketing General Inc
- Marketing Group, Inc.
- Marketvision Research
- Markmaster, Inc.
- Marquesa Hotel
- Marquette County
- Marriott Cincinnati Airport
- Marriott Cincinnati North
- Marriott Cincinnati Northeast
- Marriott Guest Services
- Marriott Houston West Loop by the Galleria
- Marriott International, Inc.
- Marriott Memphis
- Marriott Orlando Airport
- Marriott Residence Inn, Norfolk
- Marriott Residence Inn, Williamsburg
- Marriott San Francisco Fisherman's Wharf
- Marriott San Mateo San Francisco Airport
- Marriott Somerset Hotel
- Marriott St. Louis West, St. Louis MO
- Marriott Trumbull
- Marriott Waterford, Oklahoma City
- Marriott Ypsilanti at Eagle Crest
- Marriott's Bay Point Resort Village, Panama City Beach
- Marriott, Houston Hobby Airport)
- Marriott, Tucson
- Marrow Foundation
- Marsh Supermarkets, LLC
- Marsh USA, Inc.
- Marshall and Roth, PLLC
- Marshall Dennehey Warner Coleman and Goggin
- Marshall Management Inc.
- Marshall Medical Center
- Marshall Medical Center North
- Marshall Medical Center South
- Marshall Murdaugh Marketing
- Marshall United Way
- Marshalltown Area United Way
- Marshfield Area United Way
- Marshfield Medical Center