Grandparents 2020-2024 - STATES

This layer shows data related to Grandparents. This is shown by state and county boundaries. This service contains the most currently released American Community Survey (ACS) 5-year data, and contains estimates and margins of error. There are also additional calculated attributes related to this topic, which can be mapped or used within analysis. This layer is symbolized to show 'Total grandchildren in care of Grandparents.' To see the full list of attributes available in this service, go to the "Data" tab, and choose "Fields" at the top right. Current Vintage: 2020-2024 ACS Table(s): DP02 Data downloaded from: Census Bureau's API for American Community Survey Date of API call: March 3, 2026 National Figures: data.census.gov The United States Census Bureau's American Community Survey (ACS): About the Survey Geography & ACS Technical Documentation News & Updates This ready-to-use layer can be used within ArcGIS Pro, ArcGIS Online, its configurable apps, dashboards, Story Maps, custom apps, and mobile apps. Data can also be exported for offline workflows. Please cite the Census and ACS when using this data. Data Note from the Census: Data are based on a sample and are subject to sampling variability. The degree of uncertainty for an estimate arising from sampling variability is represented through the use of a margin of error. The value shown here is the 90 percent margin of error. The margin of error can be interpreted as providing a 90 percent probability that the interval defined by the estimate minus the margin of error and the estimate plus the margin of error (the lower and upper confidence bounds) contains the true value. In addition to sampling variability, the ACS estimates are subject to nonsampling error (for a discussion of nonsampling variability, see Accuracy of the Data). The effect of nonsampling error is not represented in these tables. Data Processing Notes: Boundaries come from the Cartographic Boundaries via US Census TIGER geodatabases. Boundaries are updated at the same time as the data updates, and the boundary vintage appropriately matches the data vintage as specified by the Census. These are Census boundaries with water and/or coastlines clipped for cartographic purposes. For state and county boundaries, the water and coastlines are derived from the coastlines of the 500k TIGER Cartographic Boundary Shapefiles. The original AWATER and ALAND fields are still available as attributes within the data table (units are square meters). The States layer contains 52 records - all US states, Washington D.C., and Puerto Rico. The Counties (and equivalent) layer contains 3221 records - all counties and equivalent, Washington D.C., and Puerto Rico municipios. See Areas Published. Percentages and derived counts, and associated margins of error, are calculated values (that can be identified by the "_calc_" stub in the field name), and abide by the specifications defined by the American Community Survey. Field alias names were created based on the Table Shells. Margin of error (MOE) values of -555555555 in the API (or "*****" (five asterisks) on data.census.gov) are displayed as 0 in this dataset. The estimates associated with these MOEs have been controlled to independent counts in the ACS weighting and have zero sampling error. So, the MOEs are effectively zeroes, and are treated as zeroes in MOE calculations. Other negative values on the API, such as -222222222, -666666666, -888888888, and -999999999, all represent estimates or MOEs that can't be calculated or can't be published, usually due to small sample sizes. All of these are rendered in this dataset as null (blank) values.本图层展示与祖父母（Grandparents）相关的数据，可视化边界采用州界与县界。本服务搭载最新发布的美国社区调查（American Community Survey, ACS）5年周期数据，包含各类估算值与误差边际。此外还附带与该主题相关的额外计算属性，可用于制图或分析工作。 本图层的符号系统用于展示「由祖父母照料的孙子女总数」。如需查看本服务中可用属性的完整列表，请访问「数据」选项卡，并选择右上角的「字段」菜单。 当前数据年份：2020-2024年ACS 数据表编号：DP02 数据获取来源：美国人口普查局美国社区调查应用程序编程接口（Application Programming Interface, API） API调用日期：2026年3月3日 全国统计数据来源：data.census.gov 美国人口普查局美国社区调查（ACS）： 「关于本调查」「地理与ACS技术文档」「新闻与更新」 本即用型图层可在ArcGIS Pro、ArcGIS Online及其可配置应用程序、仪表盘、故事地图（Story Maps）、自定义应用与移动应用中使用，数据也可导出以支持离线工作流。使用本数据时，请务必引用美国人口普查局与ACS作为数据源。 人口普查局数据说明：本数据基于抽样调查，存在抽样变异性。由抽样变异性导致的估算值不确定程度，通过误差边际（Margin of Error, MOE）体现。此处展示的为90%置信水平的误差边际，其含义为：估算值减去误差边际与估算值加上误差边际所构成的置信区间，有90%的概率包含真实数值。除抽样变异性外，ACS估算值还存在非抽样误差（关于非抽样变异性的详细讨论，请参见《数据的准确性》文档），本数据表未体现非抽样误差的影响。 数据处理说明： 本图层的边界数据源自美国人口普查局TIGER地理数据库的制图边界文件。边界数据与主题数据同步更新，且边界年份与人口普查局指定的数据年份完全匹配。为满足制图需求，已对包含水域和/或海岸线的普查边界进行裁切处理。针对州界与县界，其水域与海岸线数据源自50万比例尺TIGER制图边界形状文件的海岸线数据。原始的AWATER与ALAND字段仍作为数据表格的属性字段保留，单位为平方米。 州图层共包含52条记录，涵盖美国所有州、华盛顿哥伦比亚特区与波多黎各。县（及等效行政单元）图层共包含3221条记录，涵盖美国所有县及等效行政单元、华盛顿哥伦比亚特区以及波多黎各的自治市。请参见《已发布区域》文档。 百分比与衍生计数及其对应的误差边际均为计算值（可通过字段名中的「_calc_」前缀识别），且严格遵循美国社区调查的规范要求。字段别名基于数据表壳（Table Shells）生成。API中返回的-555555555误差边际值（或"*****"五个星号，见于data.census.gov网站）在本数据集中将显示为0。与这些误差边际对应的估算值已在ACS加权流程中通过独立计数进行了控制，抽样误差为0，因此其误差边际实际为0，在误差边际计算中也将按0处理。API中的其他负值，如-222222222、-666666666、-888888888与-999999999，均代表因样本量过小等原因无法计算或发布的估算值或误差边际。本数据集将此类值统一显示为空（空白）值。