According to the United States Census Bureau, the Easton CDP has a total area of , of which , or 0.46%, are water. Lake Easton, a reservoir at the junction of the Yakima and Kachess rivers, and Lake Easton State Park are at the west end of the community.
According to the United States Census Bureau, the Easton CDP has a total area of , of which , or 0.46%, are water. Lake Easton, a reservoir at the junction of the Yakima and Kachess rivers, and Lake Easton State Park are at the west end of the community.