We are now producing and releasing precinct boundary and election results data for all U.S. states on the Harvard Dataverse. This effort is generously supported by the Alfred P. Sloan Foundation and the Washington Post. This is a work in progress. Our current focus is on the 2016 election, and we are expanding our efforts to more years.

Read my op-ed in support of allowing 16-year-olds the right to vote in Los Angeles school board elections. My observation about pre-registration are drawn from this New York University Journal of Legislation and Public Policy article.

The Public Mapping Project book (Cornell University Press, free online) describes my work with the aptly named Public Mapping Project, whose goal is to provide tools and data to the public so they can draw legal districts through their web browsers. The book was released in conjunction with the award of the 2018 Brown Democracy Medal given by the McCourtney Institute for Politics at Penn State University.

A report on voter turnout in the 2018 election, written in collaboration with Non-Profit VOTE, explains the factors that drove turnout among the states.

The 2018 voting-eligible population (VEP) turnout rates are available here. In addition to these data, updates to 2014 and 2016 turnout rates have been posted to reflect new data releases from the Census Bureau and the Department of Justice. 

I am pleased to announce the release of the biennial "America Goes to the Polls", created with collaboration with the Non-Profit Voter Engagement Network. This report analyzes voter participation in the 2016 election. The full report is available here. 

I expect over 135 million people to vote in the 2016 election. These numbers are my best pre-election guess by comparing to past elections and factoring in early voting numbers. After the election, I will estimate the turnout rate from the reported election night tallies and the historical outstanding vote counted following the election.

Turnout rates for the 2016 presidential nomination contests are available here, and will be updated throughout the election season.

See here for a spreadsheet of links to the American Community Survey data tables for congressional and state legislative districts. A full list of available tables from the Census Bureau is here. In the URL, change "DP02" to "DP03", "DP04", or "DP05" to get more tables. A useful table for citizenship by age is "S0501".