- Howard University Hospital
- Howard University School of Business
- Howard University, Physicians Assistant Department
- Howard Wershbale and Company
- Howell Consulting Group, L.C.
- HP Hood LLC
- HPSInet
- HR Northwest
- HRA Research, Inc.
- HREngineer
- HRSA - Office of Performance Review
- HRSA Team
- HSC Pediatric Center
- HSHS Good Shepherd Hospital
- HSHS Sacred Heart Hospital
- HSHS St. Anthony's Memorial Hospital
- HSHS St. Francis Hospital
- HSHS St. John's Hospital
- HSHS St. Joseph's Hospital
- HSHS St. Mary's Hospital
- HSHS St. Mary's Hospital Medical Center
- HSHS St. Nicholas Hospital
- HSHS St. Vincent Hospital
- Hub City Super Center
- Hubbard Public Library
- Hubbell Mid-Atlantic Service Center
- Huberty and Associates, SC
- Hudson County
- Hudson Institute
- Hudson Library
- Huffy Corporation
- Huggins Hospital
- Hugh Chatham Memorial Hospital
- Hughes Supply Inc.
- Hughston Clinic
- Hughston Sports Medicine Hospital
- Human Resource Service
- Humana
- Humane Society of the United States - Gaithersburg
- Humane Society of the United States - Washington, DC
- Humaniz
- Humble Area Chamber of Commerce
- Humble-Intercontinental Rotary
- Humboldt County Memorial Hospital
- Humboldt County Sheriff's Office
- Humboldt General Hospital
- Humboldt Park Hospital
- Hummingbird Graphics, Inc.
- Humphrey Companies
- Hunt Community