Seattle City Directories is a free, online collection at the Seattle Public Library with directories ranging from the 1860s to the 1940s.
“The Seattle City Directory collection contains several early Seattle, Puget Sound, Washington State, and Pacific Coast directories beginning in 1867. These directories provide a great deal of information for genealogists, local history researchers, and history enthusiasts, including: historical information about Seattle and the surrounding area; addresses & occupations of residents; business listings; advertisements; and information about schools, churches, & social organizations. While most of these directories are from the late nineteenth century, we have also included the 1928 Seattle House and Street Directory – the earliest reverse directory for Seattle that lists households and businesses by address. The directories are full-text searchable, with results highlighted on the pages where they appear, and are also navigable by section and page”