The Museum Research Library is open during business hours for research on Central Skagit County history. Many items are available to browse, including books, newspapers dating back to the early 1900s, Sedro-Woolley school yearbooks, Northern State Hospital News, and assembled collections on the lumber industry and logging, churches, businesses, schools, family histories, the Loggerodeo, and many more research topics. Several guides to collections are available and more continue to be added to assist researchers.
Collections include photographs, archival records, correspondence, maps, atlases, books, and other items. Guides are available for a few larger collections, including newspapers, Northern State Hospital, Kimberley-Clark and predecessor lumber industry companies, School District 101, and Skagit Steel (in progress).