U.S. Census Data Tables & Mapping Files
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数据描述
The IPUMS National Historical Geographic Information System (NHGIS) is a free data resource providing U.S. census summary tables, time series, and GIS-compatible mapping files integrated across time and geography. It contains population, housing, agriculture, and economic data from 1790 to the present for geographic levels ranging from states and counties to tracts and blocks. NHGIS also includes related spatial products such as geographic crosswalks and standardized boundary files to support consistent analysis over time. The dataset is designed for historical, demographic, social, and spatial research, enabling users to map data, track change, and compare communities across different periods and geographic units.
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