Essential roadway research resources
Road Map Vault
The Road Map Vault is a database containing scanned images of documents in the Map and Records Center including but not limited to road construction plans, road establishment documents and survey drawings. This database is updated as new documents are received by the Map and Records Center.
King County Recorder's Office Records Search
This link is the portal to the Recorder's Office online Records Search for plats, surveys and easements.
King County Parcel Viewer
Entering a property address, a parcel number or street intersection will produce links specific to the property such as a property report, a district report and a link to any associated permits filed through the Department of Permitting and Environmental Review (DPER). The property report provides information useful for roads research such as the section, township and range and a link to the appropriate Assessor Quarter Section Map.
King County Department of Assessments eMap Search
This link is a short cut to the online collection of Assessor Quarter Section Maps. Assessor Maps contain useful information for roads research including historic and contemporary road names, recording numbers, survey numbers, the original county road numerical reference and plat names.
King County Archives
A repository of historical county government records, which are open to the public to view, by appointment only. Over three hundred collections, some dating back to 1853, serve as a permanent source of information about activities, programs, and decisions of King County agencies and elected officials. The records are in many formats, including paper, photographs, maps, and audio-visual materials. All records are open to the public by appointment.
King County GIS Map Index
An online index of various maps and resources courtesy of King County Department of Natural Resources' GIS Center.
eReal Property System
King County road systems and right-of-ways often abut with tax parcels. Use the Assessor’s online application to view parcel characteristics, values and sale history.