The WAGenWeb community has collectively indexed the 1910 census for Washington State. The TCGS indexed Franklin County, available here; Benton County was indexed by the East Benton County Historical Society and is available at their site.
The Franklin County census information is organized by surname. Open the file for the surname of interest.
Each entry provides the Surname, Given Name, the Age and Birthplace of the person as reported on the census. The Precinct, Page/Line and Enumeration District (ED) provide direct access to the corresponding entry on the census microfilm.
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