U.S. Elections Data and Resources

This site provides digital boundary definitions for every U.S. Congressional District in use between 1789 and 2012. Produced by Jeffrey Lewis at UCLA. Boundaries are available as shapefiles or GeoJSON definitions. Includes extensive documentation of how boundaries for districts were constructed.

Data for each state include shapefiles.

This tool from the Missouri Census Data Center lets you generate geographic correspondence files showing how geographic areas overlap (e.g. how ZIP codes relate with counties or counties to Congressional districts.) This post-2010-census version ("geocorr14") has the current geography. MCDC also maintains earlier versions of the application for 2000 and 1990 Census geography.

Interactive map displaying vote totals for McCain and Obama by voting precinct with additional overlays of race and income data from the Census. Appears to only work in Internet Explorer. Vote totals by precinct without the Census overlays can also be viewed as an ArcGIS map.

Explores voter turnout in the most recent municipal elections in America's 30 largest cities. Series of charts and map visualizations; map layers can be downloaded in JSON to create custom GIS maps.

Examines patterns in presidential election politics over time as well as some patterns in recent congressional election politics. Site offers numerous animated and interactive visualizations of voting in the U.S. Project out of the University of Richmond.

National map showing electoral college votes color coded by party for each presidential election back to 1789. For current election cycle, it includes state polling and forecasts.

Interactive map displaying vote totals for McCain and Obama by voting precinct with additional overlays of race and income data from the Census. Appears to only work in Internet Explorer. Vote totals by precinct without the Census overlays can also be viewed as an ArcGIS map.

Explores voter turnout in the most recent municipal elections in America's 30 largest cities. Series of charts and map visualizations; map layers can be downloaded in JSON to create custom GIS maps.