Census Block Groups

ISO-19139 Metadata

Metadata Information

Metadata character set: utf8

Last update:

Metadata contact:

Scope of the data described by the metadata: dataset

Scope name: dataset

Name of the metadata standard used: ISO 19139 Geographic Information - Metadata - Implementation Specification

Version of the metadata standard: 2007

Metadata identifier: 53c703338f6a429a877c43147c95a503

Data Identification Information

Resource citation:

Title: Census Block Groups

Date:

Reference date - creation: 2024-08-28T14:32:29

Date:

Reference date - revision: 2025-04-08T19:54:40

Descriptive keywords:

Keyword type not provided

Keywords: HIFLD, Boundaries, Tracts, Blocks, Block Group, Census 2020, National Geospatial Data Asset, NGDA, Feature Service, SDI, NSDI, Open Data, FGDC, Emergency Preparedness, Disaster Planning, Infrastructure

Abstract: Block Groups (BGs) are statistical divisions of census tracts, are generally defined to contain between 600 and 3,000 people, and are used to present sample data and control block numbering. A block group consists of clusters of blocks within the same census tract that have the same first digit of their four-digit census block number. For example, blocks 3001, 3002, 3003 . . . 3999 in census tract 1210.02 belong to BG 3 in that census tract. Block groups generally contain between 600 and 3,000 people. Most BGs were delineated by local participants in the Census Bureau's Participant Statistical Areas Program. The Census Bureau delineated BGs only where a local or tribal government declined to participate and a regional organization or State Data Center was not available to participate.A BG usually covers a contiguous area. Each census tract contains at least one BG and BGs are uniquely numbered within census tract. Within the standard census geographic hierarchy, BGs never cross county or census tract boundaries but may cross the boundaries of areas any other geographic entity. Tribal census tracts and tribal BGs are separate and unique geographic areas defined within federally recognized American Indian reservations and can cross state and county boundaries. The tribal census tracts and tribal block groups may be completely different from the census tracts and block groups defined by state and county.Download: https://www2.census.gov/geo/tiger/TGRGDB24/tlgdb_2024_a_us_substategeo.gdb.zip Layer: Block_GroupMetadata: https://meta.geo.census.gov/data/existing/decennial/GEO/GPMB/TIGERline/Current_19115/series_tl_2023_bg.shp.iso.xml

Purpose: Block Groups; January 1, 2024 vintage

Dataset language:

Dataset character set: utf8

Resource constraints:

General constraints:

Limitations of use: Access Constraints: None (Public Domain Information)Use Constraints: None (Public Use)

Resource extent:

Credits: U.S. Census Bureau

Distribution Information

Distribution format:

Format name: Feature Service

Format version:

Transfer options:

Online distribution information:

Online location: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Tracts_Blocks/MapServer/1