Evenwel v. Abbott
The Court ruled that Texas did not violate the one-person, one-vote rule by drawing its state Senate districts to have roughly equal total population, rather than equal numbers of eligible or registered voters.
The decision preserves the way nearly every state and local government in the country has drawn legislative districts for decades, rejecting a challenge that could have forced a nationwide shift toward counting only voters instead of all residents.
“We hold, based on constitutional history, this Court's decisions, and longstanding practice, that a State may draw its legislative districts based on total population.”
The Court's core holding that total-population districting satisfies the one-person, one-vote rule.
How it got here: The voters sued in federal district court, a three-judge panel dismissed their claim, and they appealed directly to the Supreme Court.
The Case in Depth
What happened
Two Texas voters, Sue Evenwel and Edward Pfenninger, lived in state Senate districts with unusually large numbers of eligible and registered voters compared to other districts. Texas, like all states, had drawn its Senate map so each district held roughly the same total population, including children, noncitizens, and other non-voters, resulting in a maximum voter-population deviation exceeding 40% between districts.
The question before the Court
Can Texas draw its state Senate districts to have equal total population, even though that means the districts have very different numbers of actual eligible voters?
The Court's answer
No — the Constitution does not require states to equalize eligible-voter or registered-voter populations across legislative districts. The Court held that using total population, as Texas and virtually every other jurisdiction does, is fully consistent with the one-person, one-vote principle drawn from the Equal Protection Clause.
Looking at the history behind the Constitution's original apportionment formula and the Fourteenth Amendment, the Court found that total population has long been treated as the proper basis for representation, because representatives serve everyone in their district, not just those who can vote. The Court did not decide whether Texas could instead have chosen to use voter population — it held only that Texas was not required to.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Had the challengers won, states and localities might have had to redraw legislative maps around voter counts rather than total population, shrinking the political influence of areas with many children, noncitizens, or other non-voters (often cities) and shifting power toward areas with higher proportions of eligible voters (often suburban and rural areas).
What changes now
This is a final merits decision resolving the challenge to Texas's Senate map, which remains in place. The Court expressly left open whether states could instead choose to use voter-eligible population when drawing districts, so that broader question about the outer limits of permissible apportionment methods remains unresolved and could return to the Court in a future case involving a state that actually adopted a voter-based map.
What this does not decide
The Court decided only that using total population is permissible, not that it is constitutionally required. It expressly declined to resolve whether a state could instead choose to draw districts based on voter-eligible population, leaving that question open for a future case involving a state that actually adopted such a map.
Concurrences and dissents
How the Justices voted
Majority (1). Justice Ginsburg (author).
Separate writings (2). Justice Thomas (author of a concurrence).
Concurrence — Justice Thomas
Justice Thomas agreed that Texas could use total population but argued the Court has never provided a coherent theory of what the one-person, one-vote principle protects. He would hold that the Constitution leaves the choice of apportionment base entirely to the states, whether total population, eligible voters, or some other nondiscriminatory measure, because no single theory of representation is constitutionally compelled.
Concurrence — Justice Alito
Justice Alito agreed Texas permissibly used total population but declined to decide whether states could instead use voter-eligible population, saying that question should wait for a case actually presenting it. He also rejected the majority's reliance on the Constitution's congressional-apportionment formula, arguing that formula was driven by political power struggles among states and slaveholding interests, not a theory of representational equality. Read the full concurrence →
How the Court got there
The legal reasoning, step by step
- The Court situated the dispute within the one-person, one-vote line of cases stemming from Reynolds v. Sims, which requires that legislative districts be roughly equal in population, and asked what population baseline the Equal Protection Clause demands.
- Examining constitutional history, the Court found that the Framers apportioned House seats among states based on total population (the Great Compromise), and that the Fourteenth Amendment's drafters, after extensive debate, rejected a proposal to switch to a voter-based formula and instead retained total population as the basis for representation.
- The Court reasoned that this history reflects a principle of representational equality — that elected officials represent all residents of a district, including children, noncitizens, and others who cannot vote, not just eligible voters.
- Reviewing its own precedents, the Court found that while some language spoke of protecting voters from vote dilution, the Court had consistently measured compliance with the one-person, one-vote rule using total-population figures, never eligible- or registered-voter data, except in one narrow instance involving Hawaii's unusual military population.
- The Court also relied on the unbroken, near-universal practice of all fifty states and countless local governments using total population for redistricting, treating this longstanding consensus as strong evidence that total-population apportionment is constitutionally permissible.
- Concluding that history, precedent, and practice all supported total-population districting, the Court held that Texas's Senate map, with an 8.04% total-population deviation, satisfied the one-person, one-vote requirement.
Doctrinal impact
Cases affected by this decision
Reaffirms Reynolds v. Sims (377 U.S. 533)
The Court relies on Reynolds as establishing that legislative districts must be apportioned on a population basis.
Distinguishes Burns v. Richardson (384 U.S. 73)
The Court treats Hawaii's use of registered-voter population as a rare exception justified by unique military population issues.