U.S. Census Block Groups

U.S. Census Block Groups This feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Census Bureau (USCB), displays Census block groups in the 50 states, the District of Columbia, and Puerto Rico. Per the USCB, "Block Groups (BGs) are clusters of blocks within the same census tract. Each census tract contains at least one BG, and BGs are uniquely numbered within census tracts. BGs have a valid code range of 0 through 9. BGs have the same first digit of their 4-digit census block number from the same decennial census. BGs coded 0 are intended to only include water area, no land area, and they are generally in territorial seas, coastal water, and Great Lakes water areas. Block groups generally contain between 600 and 3,000 people. A BG usually covers a contiguous area but never crosses county or census tract boundaries. They may, however, cross the boundaries of other geographic entities like county subdivisions, places, urban areas, voting districts, congressional districts, and American Indian / Alaska Native / Native Hawaiian areas." Block Group 2 - Census Tract 010400 (Santa Fe, NM area) Data version: This cached Esri federal service is checked weekly for updates from its enterprise federal source (Census Block Groups) and will support mapping, analysis, data exports and OGC API – Feature access. NGDAID: 70 (Series Information for Block Group State-based TIGER/Line Shapefiles, Current) OGC API Features Link: (U.S. Census Block Groups - OGC Features) copy this link to embed it in OGC Compliant viewers For more information, please visit: What are census blocks? For feedback please contact: [e-mail] NGDA Data Set This data set is part of the NGDA Governmental Units, and Administrative and Statistical Boundaries Theme Community. Per the Federal Geospatial Data Committee (FGDC), this theme is defined as the "boundaries that delineate geographic areas for uses such as governance and the general provision of services (e.g., states, American Indian reservations, counties, cities, towns, etc.), administration and/or for a specific purpose (e.g., congressional districts, school districts, fire districts, Alaska Native Regional Corporations, etc.), and/or provision of statistical data (census tracts, census blocks, metropolitan and micropolitan statistical areas, etc.). Boundaries for these various types of geographic areas are either defined through a documented legal description or through criteria and guidelines. Other boundaries may include international limits, those of federal land ownership, the extent of administrative regions for various federal agencies, as well as the jurisdictional offshore limits of U.S. sovereignty. Boundaries associated solely with natural resources and/or cultural entities are excluded from this theme and are included in the appropriate subject themes." For other NGDA Content: Esri Federal Datasets美国人口普查街区组（U.S. Census Block Groups） 本要素图层依托美国人口普查局（U.S. Census Bureau, USCB）发布的国家地理空间数据资产（National Geospatial Data Asset, NGDA）数据，展示了全美50个州、哥伦比亚特区及波多黎各的人口普查街区组。 根据美国人口普查局定义："街区组（Block Groups, BGs）是同一普查区内的街区集群。每个普查区至少包含一个街区组，且街区组在所属普查区内拥有唯一编码。街区组的有效编码范围为0至9，其编码首位数字与所属十年一次人口普查的4位街区编码首位数字一致。编码为0的街区组仅包含水域而无陆地区域，通常分布于领海、沿海水域及五大湖水域范围内。街区组一般覆盖600至3000人口的连片区域，且绝不会跨越县界或普查区边界，但可能会跨越其他地理实体的边界，例如县分区、建制聚落、城市区域、选举区、国会选区以及美洲印第安人/阿拉斯加原住民/夏威夷原住民领地。" 示例：新墨西哥州圣达菲地区普查区010400的街区组2 数据版本说明：本缓存型Esri联邦服务每周会从其企业级联邦数据源（人口普查街区组）检查更新，可支持制图、空间分析、数据导出以及开放地理空间联盟（Open Geospatial Consortium, OGC）API – 要素服务访问。 NGDAID：70（基于州级的街区组TIGER/Line形状文件系列信息，最新版本） OGC API要素服务链接：（美国人口普查街区组——OGC要素服务）请复制该链接以嵌入符合OGC标准的查看器中 更多信息指引：如需了解普查街区相关详情，请访问：什么是普查街区？ 反馈渠道：如有相关反馈，请联系：[e-mail] NGDA数据集归属：本数据集隶属于NGDA政府单位与行政及统计边界主题社区。根据联邦地理数据委员会（Federal Geospatial Data Committee, FGDC）的定义，该主题涵盖"用于治理与常规公共服务（如州界、美洲印第安人保留地边界、县界、城市/城镇边界等）、行政管理或特定用途（如国会选区、学区、消防区、阿拉斯加原住民区域公司边界等），以及用于提供统计数据（普查区、普查街区、大都市和小城市统计区边界等）的地理区域边界。上述各类地理区域的边界可通过正式法律描述或既定标准与指南确定。其他类型的边界还包括国际界限、联邦土地所有权界限、各联邦机构行政区域范围以及美国主权管辖的近海界限。仅与自然资源和/或文化实体相关的边界不属于本主题范畴，应归入相应的专项主题中。" 其他NGDA内容指引：如需获取其他NGDA相关内容，请访问：Esri联邦数据集