TIGER/Line Shapefile, Current, Nation, U.S., Tribal Block Groups
type: Dataset
keyword: national
keyword: us
keyword: ngdaid94
keyword: ngda
keyword: united-states
keyword: geoss
keyword: governmental-units-and-administrative-and-statistical-boundaries-theme
keyword: polygon
keyword: geo
keyword: ngda-portfolio-themes
keyword: tribal-block-group
keyword: north-america
keyword: nation
keyword: amerigeoss
keyword: national-geospatial-data-asset
keyword: ckan
keyword: amerigeo
description: The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. A tribal block group is a cluster of census tabulation blocks within a single tribal census tract delineated by American Indian tribal participants or the Census Bureau for the purpose of presenting demographic data on their reservation and/or off-reservation trust land. The tribal block groups are defined independently of the standard county-based block group delineation. For federally recognized American Indian Tribes with reservations and/or off-reservation trust lands with a population less than 1,200, a single tribal block group is defined. Qualifying reservations and/or off-reservation trust lands with a population greater than 1,200 could define additional tribal block groups within their area without regard to the standard block group configuration. Tribal block groups do not necessarily contain tabulation blocks always beginning with the same number and could contain seemingly duplicate block numbers. Tabulation block numbers are still assigned by using standard block groups, not the tribal block groups. To better identify tribal block groups, the letter code range A through K (except I, which could be confused with a number 1) is used uniquely within each tribal census tract. The boundaries of tribal block groups are those delineated through the Participant Statistical Areas Program (PSAP) for the 2020 Census.
issued: 2025-11-23T00:28:10.403536
modified: 2025-11-23T00:28:10.403540
spatial: Location

TIGERweb/tigerWMS_Current (MapServer)
type: Distribution
access URL: https://tigerweb.geo.census.gov/arcgis/services/TIGERweb/tigerWMS_Current/MapServer/WMSServer
description: The Open Geospatial Consortium, Inc. (OGC) Web Map Service interface standard (WMS) provides a simple HTTP interface for requesting geo-registered map images from our geospatial database. The response to the request is one or more geo-registered map images that can be displayed in a browser or WMS client application. By gaining access to our data through our WMS, users can produce maps containing TIGERweb layers combined with layers from other servers.
format: WMS
issued: 2021-10-25T22:05:40.664632
modified: 2025-11-23T00:28:10.393100

TIGERweb/TribalTracts (MapServer)
type: Distribution
access URL: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/TribalTracts/MapServer
description: The GeoServices REST Specification provides a way for Web clients to communicate with geographic information system (GIS) servers through Representational State Transfer (REST) technology.
format: Esri REST
issued: 2021-10-25T22:05:40.664634
modified: 2025-11-23T00:28:10.393676

tl_2021_us_tbg.shp.ea.iso.xml
type: Distribution
access URL: https://meta.geo.census.gov/data/existing/decennial/GEO/GPMB/TIGERline/Current_19110/tl_2021_us_tbg.shp.ea.iso.xml
description: Entity and attribute file
format: XML
issued: 2021-10-25T22:05:40.664628
modified: 2025-11-23T00:28:10.392509

US Migrating
type: Agent

tl_2021_us_tbg.zip
type: Distribution
access URL: https://www2.census.gov/geo/tiger/TIGER2021/TBG/tl_2021_us_tbg.zip
description: The TIGER/Line Shapefiles are the fully supported, core geographic product from the U.S. Census Bureau. They are extracts of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File/Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) database.
format: ZIP
issued: 2021-10-25T22:05:40.664621
modified: 2025-11-23T00:28:10.392052