GIS: Major Resources
A source for free geospatial datasets covering the entire globe at small, large, and medium scales. Includes a variety of cultural and natural features as well as elevation and bathymetric basemaps.
Digital maps covering a variety of US Census demographic categories, plus GIS data in vector boundary files for spatial aggregations of tabular census data at all levels of the census hierarchy.
NHGIS is a data portal for U.S. Census data in both tabular and geospatial formats. It provides access to summary statistics and GIS boundary files for population and agricultural censuses and other nationwide surveys from 1790 through the present. Alternatively, for a user-friendly online mapping interface connected to this same data see Social Explorer.
Online application for locating and mapping US Census data and other demographic resources. Maps created on Social Explorer can be exported as images. To download the data itself in tabular and GIS formats see National Historical Geographic Information System (NHGIS).