Dave Leip's Atlas of U.S. Presidential Elections

'''Dave Leip's Atlas of U.S. Presidential Elections''' is a website that provides tables, graphs, and maps for presidential (1789–present), senatorial (1990 and onwards), and gubernatorial (1990 and onwards) elections. Data include candidates, parties, popular and electoral vote totals, and voter turnout. County-level data is available for many years, and all data are compiled from official sources. Leip's Atlas has been cited as a "preferred source for election results" by statistician and political pundit Nate Silver. Provided by Wikipedia