Puget Sound Regional CouncilBlock Group boundaries for 2020. Block groups are clusters of blocks within the same census tract that have the same first digit of their 4-character census block number from the same decennial census. Technical Documentation: https://www2.census.gov/geo/pdfs/maps-data/data/tiger/tgrshp2020/TGRSHP2020_TechDoc.pdfArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/bf46586678cf49b3a849bddd39dd34e6_0engPuget Sound Regional Council Data PortalPublicCensus Block Groups 2020 [Washington (State)--Puget Sound Region]Web servicesWashington (State)--Puget Sound RegionWashington (State)2020