Inside, the Hatfield Library contains a 24-hour study area, private study rooms, a classroom, the university's archives, and listening rooms. On the main floor is the circulation desk, reference section, and work stations, among others. The building also holds a formal reception area, the Mark O. Hatfield Room, and the Hatfield archives that contain the former Senator's papers, both located on the second floor. Interior space was left mainly open to allow for flexibility with the evolving needs and technology of the library. Artist Dean Larson painted the portrait of Hatfield that hangs in the library.