Archive Finder is a current directory of over 5,750 repositories and over 206,000 collections of primary source material housed across the United States and the United Kingdom. Archive Finder draws from three major information sources: the Directory of Archives and Manuscript Repositories in the United States (DAMRUS), the National Union Catalogue of Manuscript Collections (NUCMC), and the National Inventory of Documentary Sources in the United States (NIDS).

Archive Finder provides information for these types of primary source material:
- Collections of original manuscript materials such as family papers, personal papers, and collections about a person or subject. This can include printed material, maps, and photographs if it is part of a larger manuscript or archival collection.
- Single item manuscripts such as diaries, logbooks, account books, or letters
- Collections of private company or government archives provided that they are regularly available to the public
- Collections consisting entirely of handwritten, typewritten, or photo-reproduced copies of manuscripts or archives
- Oral history records consisting of tapes and/or transcripts of interviews.

This product is updated annually.