Matthew B. Gilmore
(and evening research hours)
The Library of Congress is a superb public institution for researching Washington DC history. Contrary to perception it is not difficult to use, once you learn how to navigate the catalogs, reading rooms, librarians, and collections.
101 Independence Ave. SE
Thomas Jefferson Building, LJ 139
Washington, D.C. 20540-4660
The Microform Reading Room in the Jefferson Building has
They do NOT have microfilm for
BUT paper copies of these can be requested by paper call slip in the Business/Science Reading Room in the Adams Building.
The Microfilm Reading Room is open M, W, Th 9 am to 9:30 pm; AND T, F, AND Saturday 9 am to 5 pm.
Directories are published for Washington from 1822 to 1973:
The main white pages listing usually includes:
Ceased publication for Washington DC in 1973.
Note: the directory was done by canvas in the December of the year preceding, and one could ask to be excluded (noted as “refused”).
NOTE: City directories are accessible through Ancestry.com–but only by name, not address.
SEE ALSO House History Resources
FYI: a nice blog post about New York City directories: https://www.nypl.org/blog/2012/06/08/direct-me-1786-history-city-directories-US-NYC