WADOHThis measure was created by intersecting 2020 census tracts with Tribal lands boundaries maintained by the Washington Department of Ecology. Only reservation, disputed lands, and off-reservation Tribal lands were included. Citation Washington Tracking Network, Washington State Department of Health. Web. "Tribal Census Tracts". Data obtained from the Department of Ecology, 2025 Tribal Land Boundary Data. Published September 2025.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/3c044a3f0b5e45d9b95bfc7132240ada_0engState of Washington Geospatial Open Data PortalPublicTribal Census Tracts [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-27