Geographic Information Systems (GIS)

Repository for federal, state, local, and tribal government data

Over 25,000 free GIS datasets from U.S. federal, state, and local agencies, as well as international.

Collaborative catalog of open geodata websites around the world

Collaboratively developed, open source, federated web application that allows you to discover, preview, and retrieve geospatial data

Find geographic data and products such as the TIGER/Line Shapefiles, KMLs, TIGERweb, cartographic boundary files, geographic relationship files, and reference and thematic maps.

Repository of over 178,000 historical topographic maps

Combines and harmonizes geospatial data from Canada, Mexico and the United States to allow for a continental and regional perspective on environmental issues that cross boundaries.

Wiki based project that creates and distributes free geographic data for the world.

GADM provides maps and spatial data for all countries and their sub-divisions. You can browse our maps or download the data to make your own maps.

IPUMS boundary files (shapefiles) facilitate subnational, national and international data mapping. The attribute data in all shapefiles corresponds to a specific geographic variable in the IPUMS International microdata for mapping purposes.

Public platform for exploring and downloading open data, discovering and building apps, and engaging to solve important local issues. Use this site to analyze and combine Open Datasets using maps, as well as develop new web and mobile applications.Contains many of the elements that comprise the built environment, from streets to building footprints to zoning and land use data.

Great tool to explore flood data in Louisiana

Louisiana GIS data available to the public