- University of Maryland, College Park (181)
- Goddard Space Flight Center (32)
- University of Maryland University College (4)
- National History Day
Academic program for students, grades 6 through 12.
- Patuxent Wildlife Research Center (2)
- American Rare Breed Association
Information about showing, recognized breeds, breeders and more.
- Rowman & Littlefield Publishers, Inc.
Independent academic and scholarly publisher of trade books, textbooks, and monographs in the humanities and social sciences.
- Bowie Baysox (3)
- Prince George's County
Includes information on the county's judicial system and services.
- Association for India's Development (AID)
Nonprofit organization that supports a variety of social development projects, aimed at improving life for the poor and underprivileged in India.
- Glass Hammer
Features epic storytelling realized through a bewildering array of musical styles, dominated by complex melodic progressive rock.
- Mocha Moms (3)
- Washington Suburban Sanitary Commission
Provides water and wastewater services.
- Diamondback, The
Specializing in woodworking and do-it-yourself software.
- Correctional Education Association
Professional association serving educators and administrators who provide services to students in correctional settings.
Publisher of original statistical and government references. Also distributes information published by the U.S. government and international agencies.