THE KING COUNTY LAND BRIEF
Land in the
Eastern Puget Uplands setting.
King County has 2,115.8 square miles of land in Washington. 8 mapped landscape regions meet across King County: Eastern Puget Uplands, Central Puget Lowland, North Cascades Highland Forests, among others.
A glacial lowland surrounds Puget Sound with islands, bays, peninsulas and rolling terrain. Moraines, outwash plains and river terraces create a varied setting beneath the region's maritime climate.
Regional context: Puget Lowland ↗ · Regional mapping across the county footprint
Where the landscape changes
King County intersects 8 mapped regional units. The largest mapped shares are:
- Eastern Puget Uplands23%
- Central Puget Lowland16.8%
- North Cascades Highland Forests15.4%
- Western Cascades Lowlands and Valleys11.7%
- Western Cascades Montane Highlands10.8%
North Cascades in King County
Rugged high mountains and glacial terrain span a strong west-to-east climate transition. Wetter maritime forests to the west contrast with drier inland conditions on the eastern side.
Read the regional source ↗Cascades in King County
Volcanic mountains, deeply cut stream valleys and glaciated high country define the Cascades. Conifer forests change with elevation, giving way to mountain meadows and rocky alpine terrain.
Read the regional source ↗Finding your parcel within King County
The atlas lists 63 cities, towns, townships, and Census communities associated with King County, including Seattle, Vashon, Kent. The list includes overlapping geography types and does not divide the county into exclusive service areas.
King County by land and water
The Census records 191.7 square miles of water within King County, or 8.3% of its total area. That share is close to King County’s 8.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, King County has 486.6 times the land area of nearby North Bend city (4.35 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Chelan County, Kitsap County, Kittitas County, Pierce County, Snohomish County, Yakima County within Washington. A tract near one of these lines should be matched to the county identifier on its own records.

