- Springvale Terrace
- St. Joseph's Nursing Home
- Stadium Place
- Stowaway Grand Hotel
- Strike Bethesda
- Suburban Hospital
- Swan Point Yacht and Country Club, Issue MD
- Swana Solid Waste Association
- Syscom Services
- Systematic Solutions Inc.
- TASH
- Technology Consultants and Network Engineers
- The Beacon
- The Center
- The Charter House
- The Communicators Inc.
- The Golfe
- The Kevric Company Inc
- The Larry King Cardiac Foundation
- The Living Legacy Foundation of Maryland
- The Society for Post-Acute and Long-Term Care Medicine
- The Society for Vascular Ultrasound SVU)
- The Whiting-Turner Contracting Company
- Total Meeting Services
- Tower of Talent
- Trandes Corporation
- Transform Inc.
- Tri-Cor Industries, Inc.
- U-NEEK EXPO, Exposition Service Contractors
- U.S. Foodservice
- UM Capital Region Medical Center
- UM Prince George's Hospital Center
- UMBC
- United Way of Calvert County
- United Way of Cecil County, Inc.
- United Way of Central Maryland
- United Way of Charles County, Inc.
- United Way of Frederick County, Inc.
- United Way of Kent County, Inc.
- United Way of St. Mary's County, Inc.
- United Way of Washington County, Maryland, Inc.
- University Christian Church
- University of Maryland - Charles Regional Medical Center
- University of Maryland Medical Center
- University of Maryland Medical System
- University of Maryland, Dental School
- University of Maryland-Baltimore, School of Medicine
- Upper Chesapeake Health
- Urban Wildlife Program
- USAE