- 54th Massachusetts Company B Volunteer Infantry Regiment
 - Washington, D.C. area reenactment group. - 54th Massachusetts Volunteer Infantry, Company B
- Alexandria - Re-enactment group portraying an African American Civil War regiment.
- 9th & 10th (Horse) Cavalry Association
- Commemorating the accomplishments of the Buffalo Soldiers in the defence of our country. Features chapter activities, reunion information, history, and more.
- Arlington Heritage Alliance
- Arlington County - Devoted to protecting Arlington's historic and natural resources.
- Army Historical Foundation
- Arlington - Nonprofit, tax exempt organization dedicated to preserving the history and heritage of the American soldier.
- Cedar Creek Battlefield Foundation
- Middletown - Working to create, on the land where the 1864 Battle of Cedar Creek was fought, a memorial to the courage of the men who struggled there, and an educational resource for all people interested in their American heritage.
- D.C. Preservation League
- Preserves and protects the historic and built environment of Washington, DC through advocacy and education. Includes the most endangered places.
- Emmitsburg Historical Society
- Emmitsburg - Forum for reading stories and posting requests.
- Fauquier County Civil War Round Table (FCWRT)
- Sumerduck - Group of history enthusiasts dedicated to learning about and exchanging views on the U.S. Civil War.
- Friends of the Hollow, Inc.
- Markham - Nonprofit corporation dedicated to the preservation and restoration of The Hollow, the boyhood home of Chief Justice John Marshall.
- Jewish American Society for Historic Preservation
- Rockville - Identifies and promotes sites and programs of American Jewish historical interest.
- Kernstown Battlefield Association
- Winchester - Nonprofit organization dedicated to the preservation and interpretation of the 1862 and 1864 battle sites.
- Lincoln Group, The
- Springfield - Nonprofit, tax-exempt historical society devoted to the study of Abraham Lincoln. Programs are held monthly in Washington, D. C., featuring nationally and locally recognized Lincoln scholars and specialists.
- National Genealogical Society
- Arlington - A guide to the Internet for genealogists, lists of CIGs by state/country, genealogy BBS list, genealogy calendar, etc.
- National History Day
- College Park - Academic program for students, grades 6 through 12.
- National Railway Historical Society
- Offers train trips, and promotes rail safety, education, and preservation.
- National Society Daughters of the American Revolution
- National Society of the Sons of the American Revolution - District of Columbia Society
- Preservation Action
- Advocating for federal legislation that furthers the impact of historic preservation at the local, state, and national levels.
- Purcellville Preservation Association (PPA)
- Purcellville - Nonprofit organization dedicated to promoting community pride and awareness of the town's historical and natural resources.
- Rappahannock Colonial Heritage Society
- Fredericksburg - Educating the public about the Colonial-era history of the Rappahannock River Valley. Includes newsletter and information about membership and events.
- Sons of Confederate Veterans
- Upper Marlboro
- United States Capitol Historical Society
- Enhances and perpetuates the history and heritage of the Capitol, its institutions, and the individuals who have served in Congress and the Capitol.
- Waterford Foundation
- Waterford - Works to preserve and protect the historic district landmark and to help people learn about the history and preservation of the area.
- Wayside Foundation of American History and Arts
- Middletown - Dedicated to the preservation of our national heritage and values, through education.
- Western Maryland Heritage Foundation
- Boonsboro - Organization dedicated to the education, interpretation, and preservation of Western Maryland and American history, including annual events honouring the Civil War, the Revolutionary War, WWII, and beyond.
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