Washington, D.C. literature is scarce. You may use:
The Postal History of Maryland, The Delmarva Peninsula and D.C. by Smith and Kay contains post office information..
American Stampless Cover Catalog Volume II edited by David G. Phillips has an extensive section of free franks, which are indispensable for understanding Washington, D.C. postal history.
You can access my online guide of Washington, D.C. Post Offices here.
If Washington, D.C. were a state, the demand for postal history would make it the worst state. There are few collectors who collect D.C. material as they collect other states. Most of the covers are purchased by collectors for very different reasons. Needless to say, a more traditional state postal history collection focusing on D.C. would be unimpeded by competition.
Among the 50 states, the District of Columbia, R.P.O.'s and Streetcars, District of Columbia rates as the 26th state in terms of percentage of covers sold at 53.61%. It ranks 52nd in terms of the value of covers sold as percentage of all town cancels sold at 0.40%. The overall rank is 46th. This is a ten year running average. The most recent trends are about the same.
Covers For Sale
Search for a specific Washington, D.C. town. Type in the name below and press enter or click on search.
If you'd like printable version of these covers, please e-mail me.