Parcel Viewer makes searching for King County parcel information easy. You can search by address, search by parcel number, or you can just zoom in on the map and click on a parcel. Once a parcel is selected, you will get direct links to the King County Assessor’s eReal Property report and the Districts and Development Conditions report.

King County GIS data is at:
https://gis-kingcounty.opendata.arcgis.com/ (new KCGIS Open Data site)
OR
http://www5.kingcounty.gov/gisdataportal/ (legacy KCGIS data FTP download portal)

Interactive map of King County parks

Here you will find a selection of maps that have been produced by various King County departments and divisions and are hosted on the KCGIS Center website.

Maps and map applications of all kinds—interactive map viewers, downloadable maps, map collections and more—from all around King County government.

Search for maps and projects managed by King County's Department of Transportation

Voting Districts in King County, Washington (spatial)