Overview of the Population
In almost all instances, voting is based on where you live. While this system works well for most Americans, issues arise for those experiencing homelessness, people who consistently travel, such as those who live most or all year in recreational vehicles, and others with nontraditional housing. People who are otherwise eligible but do not have a permanent address still have the right to vote, but they may struggle with registering to vote and casting a ballot.
Virtually all states require voters to have proof of address to register to vote, as a way of establishing their residency in the state and jurisdiction. The definition of voting residency may not be the same as the definition of residency for other state-defined purposes. It may also differ from "domicile," which is often used to determine where someone lives for other state purposes. Definitions of domicile vary across states as well.
The difference between residency and domicile is not always clear. According to Black's Law Dictionary, residence is traditionally a "fixed abode where one actually lives." Domicile is the "place where a person intends eventually to return and remain." States often use the word "residence" in their election codes when they actually mean domicile. Some states make this explicit, saying that residency for voting purposes is a domicile. Others don't spell this out but use language that typically indicates domicile when describing voter residency requirements. Phrases such as "intent to remain indefinitely" or "permanently," or the "place to which a person returns after being gone" resemble a typical understanding of domicile.
In some states, voting residence and domicile are separate concepts. Some state statutes explicitly note that they are defining residency "for voting purposes only," suggesting that voting residence is not the same as domicile. Other states don't clearly say they are defining voting residence as something separate from domicile, but they don't use the terms that typically define a domicile, suggesting voter residence might be different than domicile in those states. State courts may play a role in fleshing out these definitions and differences.