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National Historical Geographic Information System
NHGIS provides, free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2012.
The US Census' TIGER Products are spatial extracts from the Census Bureau's MAF/TIGER database, containing features such as roads, railroads, rivers, as well as legal and statistical geographic areas
Florida Geographic Data Library
With the Metadata Explorer, you can search, browse, and download data from the FGDL, a mechanism for distributing spatial (GIS) data throughout the state of Florida
Enables everyone to find, use and share geographic data and maps. Easily create rich interactive visualizations to solve problems without any experience using traditional mapping tools.
"IPUMS-USA is a project dedicated to collecting and distributing United States census data. Its goals are to: Collect and preserve data and documentation, Harmonize data and Disseminate the data absolutely free!"
A free tool to download international GIS data by country