Washington D.C.
- History
- 1850 Washington, D.C. Mortality Schedule
- 1895 U.S. Atlas: District of Columbia
- African American Civil War Museum
- Arlington National Cemetery
- Behind the Scenes In Washington (1873)
- Black Renaissance in Washington, DC, 1920-1930s
- Capital and the Bay: Narratives of Washington and the Chesapeake Bay Region, ca. 1600-1925
- City Museum of Washington, DC
- Cyndi's List of Genealogy Sites on the Internet: District of Columbia
- Daughters of the American Revolution Museum
- DC Preservation League
- DCGenWeb
- District of Columbia Surnames in the RootsWeb Surname List
- Explore DC
- Google: Washington, DC - History
- Historical Society of Washington, DC
- Jewish Genealogy Society of Greater Washington
- The Mall
- National Museum of American History
- National Portrait Gallery
- Old Maryland & Washington, D. C. Genealogy, History & News
- Panoramic Maps 1847-1929: District of Columbia
- Perry-Castaņeda Library Map Collection: District of Columbia
- Roose's Companion and Guide to Washington and Vicinity (1876)
- Sights and Secrets of the National Capital (1869)
- United States Capitol Historical Society
- Victorian Secrets of Washington, DC
- Washington and Georgetown Directory (1853)
- Washington as It Was
- Washington, D.C., Sights Before 1850: A Select List of Images
- Washington Post: 125 Years of The Post
- Washington Post: Washington's First Century
- Yahoo!: Washington, DC - History