Washington DC / Baltimore metropolitan area is an increadibly rich area for research in Jewish and Israel Studies. The following institutions are among the most useful in this area. Before going there, please try to get in touch with these institutions to verify their times of operation, rules of using the collections, availability of printing, disability access, etc.
There are still many guides to archival collections that are in print format, in a form of a print bibliography. However, more and more archives are going online with the detailed descriptions of their collections. As you can see, this trend is reflected below.