THE JEFFERSON COUNTY LAND BRIEF
Land in the
Low Olympics setting.
Jefferson County has 1,803.7 square miles of land in Washington. 6 mapped landscape regions meet across Jefferson County: Low Olympics, High Olympics, Olympic Rainshadow, among others.
Pacific-facing coastal mountains support moisture-loving conifers, with marine terraces, dunes and beaches along the ocean edge. Inland slopes and the immediate coast have different vegetation patterns.
Regional context: Coast Range ↗ · Regional mapping across the county footprint
Where the landscape changes
Jefferson County intersects 6 mapped regional units. The largest mapped shares are:
- Low Olympics41.7%
- High Olympics23.1%
- Olympic Rainshadow13.4%
- Coastal Uplands10.8%
- Volcanics9.8%
North Cascades in Jefferson 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 ↗Puget Lowland in Jefferson County
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.
Read the regional source ↗Finding your parcel within Jefferson County
The atlas lists 7 cities, towns, townships, and Census communities associated with Jefferson County, including Port Ludlow, Brinnon, Quilcene. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Jefferson County by land and water
The Census records 384.2 square miles of water within Jefferson County, or 17.6% of its total area. That share is close to Jefferson County’s 17.6%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Jefferson County has 204.7 times the land area of nearby Quilcene CDP (8.81 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Clallam County, Grays Harbor County, Island County, Kitsap County, Mason County, San Juan County within Washington. A tract near one of these lines should be matched to the county identifier on its own records.

