The National Historical Geographic Information System (NHGIS) provides easy access to summary tables and time series of population, housing, agriculture, and economic data, along …

Apply Filters How to use the Data FinderSelect Data

The IPUMS National Historical Geographic Information System (NHGIS) provides free online access to summary statistics and GIS files for U.S. censuses and other nationwide surveys …

NHGIS geographic crosswalks describe how U.S. census summary data from one year correspond to geographic units for another year. The crosswalks are designed to support high …

Select Data Whether you want to obtain a specific data resource or you would like to explore what is available, the NHGIS Data Finder is the place to start, accessible through any of the site's …

IPUMS.ORG REGISTER LOG IN NHGIS GEOMARKER National Historical GIS Home Select Data My Data Support

REGISTER LOG IN GEOMARKER National Historical GIS Home Select Data My Data Support

File format and geometryGeometry yearsNote on 2009 census tracts and block groupsDerivationStandard procedures for boundary files1980 and earlier boundaries based on …

All persons are granted a limited license to use data and documentation from IPUMS NHGIS, subject to the following conditions:Redistribution: You will not redistribute the data without …

What are time series tables? An NHGIS time series table links together comparable statistics from multiple U.S. censuses and surveys in one downloadable bundle. A table is comprised of one …