USA Census Counties 2020

Overview This feature service provides 2020 U.S. Census county and county equivalent boundaries for the 50 states and the District of Columbia. It includes polygon features representing county geography and supporting attributes for identification, location, and population analysis. Data Content The layer includes county name, state name and abbreviation, Federal Information Processing Standards codes, 2020 total population, population density, and area measurements. These attributes support geographic reference, demographic summary, and cartographic display. Source and Update Information The county boundaries are sourced from U.S. Census Bureau TIGER/Line geography and enhanced with detailed coastline edits for cartographic use. The layer is updated annually and includes 2020 Census population data from the Public Law 94 redistricting summary file. Use Cases County-level demographic mapping and reporting Reference boundaries for regional planning and analysis Population density and area-based visualization Use in ArcGIS apps, dashboards, StoryMaps, and custom GIS workflows Geographic Coverage The service covers the United States at the county level, including the 50 states and the District of Columbia. Citation Use the U.S. Census Bureau as the source citation when referencing this data.### 概述 本要素服务提供2020年美国人口普查针对50个州及哥伦比亚特区的县级及县级等效行政区边界数据。其包含表征县域地理范围的多边形要素，以及用于标识、定位与人口分析的配套属性字段。 ### 数据内容 该图层包含县级名称、州名及州简称、联邦信息处理标准（Federal Information Processing Standards, FIPS）代码、2020年总人口数、人口密度与面积度量值。这些属性可支撑地理参照、人口统计汇总与制图展示需求。 ### 来源与更新说明 县级边界数据源自美国人口普查局TIGER/Line地理数据集，并针对制图用途优化了海岸线编辑细节。本图层按年度更新，同时包含源自《公法94》选区重划汇总文件的2020年人口普查人口数据。 ### 应用场景 1. 县级层面的人口统计制图与报告编制； 2. 区域规划与分析的参考边界； 3. 人口密度及基于面积的可视化展示； 4. 可用于ArcGIS应用程序、仪表盘、故事地图（StoryMaps）以及自定义地理信息系统（GIS）工作流。 ### 地理覆盖范围 本服务覆盖美国县级行政区范围，包含50个州及哥伦比亚特区。 ### 引用规范 引用本数据时，请以美国人口普查局作为来源标注。