We are a repository of historical King County government records, which are open to public view. Over three hundred collections comprising over 18,000 cubic feet, some dating back to 1853, serve as a permanent source of information about activities, programs, and decisions of County agencies and elected officials. Our records are in many formats, including paper, photographs, maps, and audio-visual materials.

They include legislative records - County Commissioner's resolutions (1853-1968) and County Council ordinances and motions (1969-1999), a special collection of over 6,000 County documents, pre-charter legislation, administration and policy decisions, early road and bridge establishment and inspection records and records and policies from former County Executives.

Some King County government records are also held by the Puget Sound Regional Branch of the Washington State Archives, which began collecting materials before the establishment of the King County Archives program in 1990.