A shared commons of data and tools for the United States..

From Tim Groseclose.

An Archive of Administrative Agency Data from Tony Bertelli and Christian Grose..

Offers a measure of the political liberalism-conservatism of states, congressional districts, cities, state senate and assembly districts, and partisans within these areas.

Aims to measure the ideology of individual state legislators and state legislatures as a whole over the past several decades, state and individual-level data available..

Established in 1999 at the University of California, Santa Barbara, archives contain 103,280 documents related to the study of the Presidency..

The primary source for biographical information on Members of the United States Congress and Continental Congresses..

Useful data on America's first branch of government, including data on the composition of its membership, its formal procedure, informal norms, party structure, and staff.

Responsible for collecting and processing data for California's decennial redistricting..

A leading source of scholarly research and current data about women's political participation in the United States..

A leading center for the quantitative study of politics at the Univ. of Michigan..

Great resource on Congressional Committees.

Site features data collected by the Congress project, as well as links to other sites providing data and information on the U.S. Congress..

Useful, basic tables on roll call votes in House and Senate (101-present).

information about more than 400,000 bills introduced in the U.S. Congress, currently 1947-2008, along with extensive information about each bill's progress and sponsor.

This data set includes traditional aggregate voting scores as well as Cooper-Young structuring scores from the 40th through the 111th Congresses (1867-2009).

Aims to compile, disseminate, and encourage the use of data relevant to U.S. state policy research, tracking policy differences across and change over time in the 50 states.

This page contains links to data on Cosponsorships in the U.S. Senate and U.S. House of Representatives for the 93rd to 108th Congresses..

Seeks to define an open future for our data, for a better government and a better society, through research, education, and programming..

Guide to data from more than 100 agencies that provide data and trend information on such topics as economic and population trends, crime, education, health care, energy use and more.

A general resource for the study of campaign finance and ideology in American politics by Adam Bonica..

Supports research that addresses global concerns including human rights, social justice, peaceful solutions to social conflicts and environmental sustainability..

Research on economic mobility, see data and replication code.

From the National Archives Federal Register.

Accessible, comprehensive analysis of available data sources to answer critical questions about gig and non-traditional work in the United States..

The site helps ordinary citizens find and track bills in the U.S. Congress and understand their representatives' legislative record..

A leading research and policy organization committed to advancing sexual and reproductive health and rights, great source of data on policies in the United States..

precise research methodology to calculate a Legislative Effectiveness Score for each member of the House of Representatives.

Datasets on the lobbying activities of major companies..

NCSL research and special features contain a wealth of informatiom about state legislatures.

The primary federal entity for collecting and analyzing data related to education.

Publishes among other things, legislator and lobbyist effectiveness rankings..

Searchable collection of election returns from the earliest years of American democracy..

A collection of tools that make it possible for citizens to track what is happening in their state's capitol by aggregating information from all 50 states, Washington, D.C., and Puerto Rico..

Focused on the House of Representatives.

Explores the impact of the president on legislators' voting and position taking, on their communications with constituents, on their legislative strategies, and ultimately, on the substance of legislation..

Research on the effects of gerrymandering in the U.S..

A collection of sophisticated school finance measures for assessing the adequacy and fairness of each state's revenue, spending, and resource allocation, and for comparing these outcomes between states..

From the Kaiser Family Foundation..

A compilation of many state-to-state relational variables, including measures of shared borders, travel and trade between states, and demographic characteristics of state populations..

State and Local Public Policies in the United States is an ongoing research project and data compendium. On this website you can download spreadsheets containing data on state policies..

Publishes three to four statewide public opinion polls each year to assess the opinions of registered voters on upcoming elections, public policy, and attitudes towards politics, politicians, and government..

Information source for the United States electoral system; great data on voter turnout..

Collects and organizes data from various archived sources to trace changes in the national policy agenda and public policy outcomes of the United States since the Second World War..

With some cool visualizations of the data..

From the U.S. Senate library.

Compiled by the Brookings Institution.

Allows users to view every congressional roll call vote in American history on a map of the United States and on a liberal-conservative ideological map..

Keith Poole's web site for data on U.S. Congress, well-organized, thoroughly documented, updated frequently..