VoteWorld Comparative Parliamentary Roll-Call Voting Reference File

United States of America

Basic Information:
Parliament website:
Size of parliament: 435 (house), 100 (senate)
Form of government: presidential
Electoral system: plurality, single-member districts
Continuous democracy since: 1789
Last parliamentary election: 2 November 2004
Freedom House political freedom score in 2004: 1
Population: 293.0 million


U.S. House and Senate

US House of Representatives

US Senate

Contact: Keith Poole (University of California, San Diego) and Howard Rosenthal (Princeton University)
Period covered: 1789-2004

State Legislatures

  • Contact: Gerald Wright (Indiana University)

Period covered: 1999-2000


  • Nolan McCarty (Princeton University)

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Contact Person: Heddy Riss
Technical Questions: Webmaster