Registered Voter

A registered voter is an individual who has completed the administrative process required to appear on a government-maintained list of people eligible to vote in a specific electoral district. Registration typically requires proof of citizenship, age (usually 18 or older), residency, and—in some jurisdictions—an absence of disqualifying criminal convictions or mental incapacity findings.

Registration systems vary widely across democracies:

• Opt-in registration: Used in the United States, where prospective voters must affirmatively apply, often through state-level systems. The National Voter Registration Act of 1993 (the "Motor Voter" law) required states to offer registration alongside driver's license applications.
• Automatic or state-initiated registration: Used in countries such as Germany, Sweden, and Argentina, where the state enrolls eligible citizens from civil or population registers without individual action.
• Compulsory registration: In Australia, registration on the electoral roll has been compulsory for eligible citizens since 1924, administered by the Australian Electoral Commission.

Being a registered voter is distinct from being an eligible voter (someone who meets legal qualifications but may not be enrolled) and from an actual voter (someone who casts a ballot). Turnout statistics are often reported two ways: as a share of registered voters or as a share of the voting-age population, and the gap between these measures can be substantial. In the United States, for example, roughly 25–30% of eligible citizens are typically unregistered at any given time.

Voter rolls are also politically consequential beyond election day. They underpin jury selection in many U.S. states, determine the universe for political party primaries, and are used by campaigns for canvassing and microtargeting. Disputes over roll maintenance—including purges of inactive voters—have produced significant litigation, such as Husted v. A. Philip Randolph Institute (2018), in which the U.S. Supreme Court upheld Ohio's process for removing voters who failed to respond to confirmation notices.