Mainly textual items such as letters, diaries, minutes, and reports documenting the lives and interactions of individuals and families, and the functions and activities of organizations.

Documentary photograph collections include black-and-white photographic prints and negatives, glass lantern slides, 35mm color slides, and postcards, along with rare formats such as stereocards and daguerrotypes.

The University of Washington Archives include the permanent public records that document the University's development; papers of faculty and professional staff that reflect the academic and administrative life of the University; University Publications and Imprints; and records of student life.