HMdb.org: District of Columbia Markers
- Information on historical markers, with photos.
- http://www.hmdb.org/Results.asp?State=District%20of%20Columbia

Wikipedia: History of Washington, D.C.
- Article from the online encyclopedia Wikipedia.
- http://en.wikipedia.org/wiki/History_of_Washington,_D.C.

Boundary Stones of Washington, D.C.
- Describes and locates the 40 boundary stones placed in 1791 and 1792 to demarcate the boundaries of the District of Columbia. Includes photos and interactive map.
- http://www.boundarystones.org/

Records of the Columbia Historical Society, Volume 5
- 1902 volume of essays on DC local history and records of the Society. Digitized full text of the original 1902 edition from Google Books.
- http://books.google.com/books?vid=OCLC01564221&id=VitLLgVhDBAC

The Seat of Government of the United States
- By Joseph B. Varnum, Jr. 1854 work discusses the decision about where to locate the Federal capital and the subsequent development of Washington. Digitized full text (121 pages) of the original 1854 edition from Google Books.
- http://books.google.com/books?vid=OCLC03828055&id=RddxDLPgdXkC

Bibliography of the District of Columbia
- Bibliography of books, maps, newspapers and magazine articles on the subject up to 1898. Digitized full text (211 pages) of the 1900 edition from Google Books.
- http://books.google.com/books?vid=OCLC67890374&id=xLsXAAAAMAAJ

Walks about Washington
- By Francis E. Leupp. 1915 informal account of Washington history and sights. Digitized full text (291 pages) of the 1915 edition from Google Books. Includes drawings by Lester G. Hornby.
- http://books.google.com/books?vid=OCLC00774504&id=pNoBAAAAMAAJ

Records of the Columbia Historical Society, Volume 19
- 1916 volume of essays on DC local history and records of the Society. Digitized text of the original edition from Google Books.
- http://books.google.com/books?vid=OCLC01564221&id=sw9-TZx1hLgC

Records of the Columbia Historical Society, Volume 9
- 1906 volume of essays on DC local history and records of the Society. Digitized text of the original edition from Google Books.
- http://books.google.com/books?vid=OCLC01564221&id=jddBJhqHjycC

Records of the Columbia Historical Society, Volume 7
- 1904 volume of essays on DC local history and records of the Society. Digitized text of the original edition from Google Books.
- http://books.google.com/books?vid=OCLC01564221&id=BiMHPZAxcIkC

Washington
- Article on the city from the 1911 edition of the Encyclopedia Britannica.
- http://www.1911encyclopedia.org/Washington_DC

Some Early Churches and Synagogues in the Washington, DC Area
- List of early houses of worship.
- http://www.rootsweb.com/~dcgenweb/earlychurches.htm

The George Washington University: Gelman Library Special Collections
- Extensive collections on the history of the university and on local history. Has comprehensive information on the library and its holdings, which can be searched or browsed online, collection finding aids, an encyclopedia on the history of the university
- http://www.gwu.edu/gelman/spec/

H-DC, Washington, D.C. History Network
- Refereed discussion list on Washington, DC, history and culture. Has forum, book reviews, bibliographies and links to online resources.
- http://www.h-net.org/~dclist/

Explore DC
- An exploration of the city and its role as National Capital. Covers local history and neighborhoods, key Federal government institutions, the city's African-American heritage, U.S. Presidents, and special-interest virtual tours. Includes video and audio c
- http://www.exploredc.org/

Pennsylvania Avenue National Historic Park
- Story of the historic avenue. Official National Park Service site.
- http://www.nps.gov/paav/pa_visit.htm

The Mall
- History of the Capital's central park and its development in the 19th and 20th centuries. Plans, photos, drawings, and bibliography.
- http://xroads.virginia.edu/~CAP/MALL/home.html

Washington, D.C., Railroad History
- Brief chronology. From the Washington, D.C., Chapter of the National Railway Historical Society website.
- http://www.dcnrhs.org/dc_rail_history.htm

Political Graveyard
- Burial places of politicians.
- http://politicalgraveyard.com/geo/DC/wa.html#CEM

Origins of the Name District of Columbia
- Summarizes the District's evolution as a jurisdiction.
- http://dcpages.com/Tourism/History_and_Culture/041500dcname.shtml

Flag of the District of Columbia
- Brief account of how DC got its flag. From DC Watch magazine.
- http://www.dcwatch.com/richards/0106f.htm

The Capital and the Bay: Narratives of Washington and the Chesapeake Bay Region, ca. 1600-1925
- A digital library of 141 books from the collections of the Library of Congress dealing with the history of Washington and the Chesapeake Bay area of Maryland and Virginia. Search by keyword or browse by subject, author, or title. Documents are displayed i
- http://memory.loc.gov/ammem/lhcbhtml/

Washington, DC History
- Brief history of the city from 1571 to 1817.
- http://www.dcpages.com/History/