Archive Finder is a database that provides information on primary source materials from over 4,800 archival and manuscript repositories in the United States. 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 Documentory Sources in the United States (NIDS).

Leads to repository and collection records that include NIDS and NUCMC records, links to online finding aids, information on repositories and links to repository home pages.