- Organization of American States@
- Privacy International
 - Human rights group that monitors privacy and surveillance issues worldwide. - BoardSource
- Seeks to improve the effectiveness of nonprofits by strengthening their boards of directors. Formerly the National Centre for Nonprofit Boards (NCNB).
- International City/County Management Association (ICMA)@
- United States Naval Institute
- Established in 1873 to provide an open forum for the exchange of ideas, to disseminate and advance the knowledge of sea power, and to preserve America's naval and maritime heritage.
- National Fallen Firefighters Foundation@
- Emmitsburg
- Generations United
- National coalition of intergenerational groups.
- Center for Equal Opportunity
- Studies issues of race, ethnicity, and assimilation, including; affirmative action, bilingual and multicultural education, and immigration.
- American Coalition for Fathers and Children
- Assists men, fathers, and second families who are having divorce problems.
- Taxpayers Against Fraud
- Nonprofit organization dedicated to combating fraud against the Federal Government through the promotion and use of the qui tam provisions of the federal False Claims Act.
- Institute for Gay and Lesbian Strategic Studies
- Institute for research and analysis on questions important to lesbian, gay, bisexual, and transgendered Americans. Download policy reports and studies on issues such as same-sex marriage, homosexuality in the media, and gay-straight youth alliances.
- SPRY Foundation
- Brings together information from federal agencies and national associations on issues of interest to older adults.
- 60 Plus Association
- Arlington - Nonpartisan advocacy group with a free enterprise, less government, less taxes approach to seniors' issues.
- Business Executives for National Security, Inc.
- National, nonpartisan organization of business leaders who apply the lessons of their successful businesses to making the country safer and more secure.
- National Air Disaster Alliance/Foundation
- Advocacy organization raising the standard of safety, security, survivability, and support.
- American Folklore Society (AFS)
- Arlington - Association of people who create and communicate knowledge about folklore throughout the world.
- Marine Fish Conservation Network
- Coalition dedicated to conserving marine fisheries and to promoting their long-term sustainability.
- Fund for American Studies, The
- North-South Skirmish Association, Inc.
- Winchester - Civil War, blackpowder weapons.
- Labor Heritage Foundation, The
- Works to strengthen the labour movement through the use of music and the arts.
- American Council for Capital Formation
- Offers research findings and publications promoting national economic growth through sound tax, regulatory, and environmental policies.
- Storyfest School of Sacred Storytelling
- Hagerstown
- Frederick County Humane Society
- Frederick - Nonprofit voluntary organization dedicated to the humane treatment of animals. Listings and photos of dogs & cats available for adoption in Frederick County, Maryland.
- Monocacy Canoe Club
- Frederick - Family oriented canoe & kayak club centred in Baltimore/Washington area.
- Citizens' Commission on Civil Rights
- Established to monitor civil rights policies and practices of the federal government and seek ways to accelerate progress in the area of civil rights.
- National Humanities Alliance
- Created to unify public interest in support of federal programs.
- Progressive Maryland
- Silver Spring - Unites community, faith, and labour organizations with other progressive individuals.
- Defenders of Property Rights
- National public interest legal foundation devoted exclusively to protecting private property rights.
- American Jail Association
- Hagerstown - National nonprofit organization dedicated to supporting those who work in and operate our jails.
- Heinrich Böll Foundation North America
- Nonprofit political foundation affiliated with the German party of Alliance 90/The Greens. Strives to promote democratic ideas, civil society, and international understanding through work in ecology, democracy, solidarity, gender equality, and non-violence.
- Wagner Society of Washington, DC
- Group of Wagner fans in America's capital.
- Washington Metro Objectivism Discussion (WMOD)
- Holding monthly meetings in the Washington DC metro area to discuss topics related to the ideas of novelist and philosopher Ayn Rand.
- Population Resource Center
- Organizes programs that provide policymakers with population data.
- WETA/CapAccess
- Lists education, health, entertainment, and social service programs.
- United Planning Organization
- Designated community action agency providing a variety of human service programs.
- Brewster Society, The
- Bethesda - International organization for designers, collectors, and lovers of kaleidoscopes. Founded by Cozy Baker, the "First Lady of American kaleidoscopes."
- Arlington County Civic Federation
- Arlington - Addresses civic issues and advocates for neighbourhoods.
- International Country Club
- Fairfax - Offers golf, tennis, swimming, and fine dining for banquets and special events.
- Roadway Safety Foundation (RSF)
- National organization solely dedicated to reducing highway deaths and injuries by improving the physical characteristics of America's roads.
- Berkeley County Historical Society
- Martinsburg - Dedicated to the preservation and perpetuation of history in Berkeley County, West Virginia.
- Congressional Black Caucus Foundation (CBCF)
- Educates future leaders and promotes collaboration among legislators, business leaders, minority-focused organizational leaders, and organized labour to effect positive and sustainable change in the African American community.
- Books for America
- Distributes donated books, movies, music and instructional CDs, audiobooks, and more to organizations in the United States serving needy communities and individuals.
- Texas State Society of Washington, DC
- Fosters and a fraternal spirit among Texans in the nation's capital.
- Confederate Memorial Association
- Dedicated to the preservation of the finest traditions of Southern culture and history.
- National Federation of Nonprofits
- Advocates for nonprofits in postal, regulatory, legislative, and accountability issues.
- Foodspeak Coalition for Free Speech
- Coalition of civil liberty, health, environmental, public interest, media, and law groups dedicated to ensuring freedom of expression concerning food and food safety.
- Potomac Bonsai Association (PBA)
- Umbrella organization comprised of ten bonsai clubs and one viewing stone group in Virginia, Maryland, Pennsylvania, and Washington D.C.
- Frederick County Art Association, Inc.
- Frederick - Includes sponsored events, member meetings and details of association activities.
- Campagna Center
- Alexandria - Human services organization serving children and families in need.
- Millennium Institute
- Arlington - Provides resources, ideas, and plans for organizing thoughtful observances of humanity's entry into the next millennium.
- National Railway Historical Society - Hagerstown Chapter
- Hagerstown
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