Louisiana redistricting is controlled by the state legislature, which redraws congressional and state legislative district lines after each decennial census and passes them as ordinary legislation subject to the governor’s veto. The most recent cycle produced a four-year court fight that ended in April 2026, when the U.S. Supreme Court struck down Louisiana’s congressional map in Louisiana v. Callais and, in doing so, tightened the legal standards that govern race and redistricting nationwide.
Who Draws the Maps
Article III, Section 6 of the Louisiana Constitution requires the legislature to reapportion state House and Senate districts “as equally as practicable” by the end of the year following the release of each decennial census.1Louisiana State Senate. Louisiana Constitution Article III – Legislative Branch Congressional redistricting is not addressed by Section 6, but follows the same path in practice: the legislature draws the maps and enacts them as ordinary bills.2Louisiana House of Representatives. Redistricting Frequently Asked Questions
The constitution also builds in a backstop. If the legislature misses its deadline on state legislative maps, any registered voter can petition the Louisiana Supreme Court, which then draws the districts itself.1Louisiana State Senate. Louisiana Constitution Article III – Legislative Branch That provision has never been triggered.
How a Map Becomes Law
A redistricting plan moves through the Louisiana Legislature the same way any other bill does. A lawmaker introduces it, committees hear it, and both chambers must pass identical language before it reaches the governor.2Louisiana House of Representatives. Redistricting Frequently Asked Questions Public hearings before and during the session give citizens a chance to comment.
The governor can sign the map or veto it. Overriding a veto takes a two-thirds vote of all elected members in each chamber, which makes the governor a real check rather than a formality.3Justia Law. Louisiana Constitution Article III – Legislative Branch
Rules Every Map Must Follow
Louisiana Joint Rule 21 pulls the state-level requirements into a single framework covering congressional, state legislative, and other statewide body maps.4Louisiana State Legislature. Louisiana Joint Rule 21 – Redistricting Criteria Every plan must clear both these state criteria and federal constitutional standards.
Equal Population
Districts must hold roughly the same number of people. The rule comes from the Fourteenth Amendment’s Equal Protection Clause and the Supreme Court’s “one person, one vote” principle: your vote should carry about the same weight regardless of the district you live in.5Constitution Annotated. Fourteenth Amendment Section 1 – Voting Rights Generally
How tight that standard is depends on the type of district. Congressional districts must come as close to mathematically equal as practicable. State legislative districts have more room: Joint Rule 21 bars any plan where a district’s population deviates more than five percent above or below the ideal.4Louisiana State Legislature. Louisiana Joint Rule 21 – Redistricting Criteria All plans use the P.L. 94-171 redistricting data released by the U.S. Census Bureau as the official population count.6U.S. Census Bureau. Decennial Census P.L. 94-171 Redistricting Data Summary Files
Contiguity, Precincts, and Communities
Every district must be contiguous, meaning all parts of it physically connect. Mapmakers must also respect parish, municipality, and other political subdivision boundaries where possible, and keep communities of interest together. Joint Rule 21 gives communities of interest priority over political subdivision boundaries when the two conflict.4Louisiana State Legislature. Louisiana Joint Rule 21 – Redistricting Criteria
Plans should keep whole election precincts intact when practicable. If a precinct must be split, it should be divided into as few districts as possible using a visible census boundary. For state legislative maps, the rules also call for “due consideration” of traditional district alignments, discouraging wholesale reshuffling without good reason.
Race and the Voting Rights Act
Section 2 of the Voting Rights Act (52 U.S.C. § 10301) prohibits any voting practice that denies or limits the right to vote based on race. In redistricting, that means a state cannot draw maps giving minority voters less opportunity than others to participate and elect their preferred candidates.7Office of the Law Revision Counsel. 52 USC 10301 – Denial or Abridgement of Right to Vote A violation occurs when, on the totality of the circumstances, the political process is not equally open to a protected class.
Since 1986, courts evaluating vote-dilution claims have used the three-part test from Thornburg v. Gingles. A challenger must show that the minority group is large and geographically compact enough to form a majority in a single district, that the group votes cohesively, and that the white majority votes as a bloc in a way that usually defeats the minority-preferred candidate.8Congressional Research Service. The Voting Rights Act of 1965 at 60 Years
The Supreme Court substantially tightened all three prongs in April 2026. Under the new framework from Louisiana v. Callais, plaintiffs must present an alternative map that meets every one of the state’s legitimate redistricting goals, including traditional criteria and any specified political objectives, without using race as a drawing criterion. Race-conscious illustrative maps, previously the standard way of showing that a majority-minority district was possible, are no longer permitted.9Supreme Court of the United States. Louisiana v. Callais, No. 24-109 (2026)
The Court also raised the bar on racially polarized voting. Challengers must control for party affiliation when analyzing whether white voters bloc-vote against minority-preferred candidates; if voting patterns can be explained by partisanship rather than race, the claim fails. When courts weigh the broader circumstances, the opinion directs them to focus on evidence of present-day intentional racial discrimination rather than historical conditions or generalized effects of past societal discrimination.9Supreme Court of the United States. Louisiana v. Callais, No. 24-109 (2026)
Partisan Gerrymandering Is Not a Federal Issue
Racial gerrymandering remains subject to federal court review. Partisan gerrymandering does not. In Rucho v. Common Cause (2019), the Supreme Court held that claims about maps drawn to favor one political party are “political questions beyond the reach of the federal courts,” concluding there were no manageable legal standards for deciding when partisan advantage crosses a constitutional line.10Supreme Court of the United States. Rucho v. Common Cause, No. 18-422 (2019) Even if Louisiana’s maps heavily favor one party, the remedy lies with the legislature, the governor, or potentially state courts applying state constitutional provisions.
The 2022–2026 Map Fight
After the 2020 census, the Louisiana Legislature passed a congressional map in 2022 with only one majority-Black district out of six, despite Black residents making up roughly a third of the state’s population. In Robinson v. Ardoin, a federal judge in the Middle District of Louisiana ruled the map likely violated Section 2 because it failed to include a second majority-Black district. The Fifth Circuit later gave the legislature time to act on its own.9Supreme Court of the United States. Louisiana v. Callais, No. 24-109 (2026)
The legislature responded with SB 8 in January 2024. The new map redrew the 6th Congressional District as a second majority-Black district, running diagonally from Baton Rouge up the Red River corridor through Alexandria to Shreveport. The 2nd District around New Orleans remained the state’s original majority-Black district. SB 8 was used for the November 2024 elections.
A separate group of voters in the Western District of Louisiana then sued. In Callais v. Landry, a three-judge federal panel held that race was the predominant factor behind the 6th District’s shape and that the Voting Rights Act did not actually require the state to create a second majority-Black district. On April 29, 2026, the U.S. Supreme Court affirmed and struck down SB 8, holding that because Section 2 did not compel the additional district, no compelling interest justified the race-based line-drawing.9Supreme Court of the United States. Louisiana v. Callais, No. 24-109 (2026)
The case has been remanded, and Louisiana will need a new congressional map. Whether the legislature produces one or a court imposes a remedial plan depends on how the process moves against the next election cycle.
What Comes Next for the 2030 Cycle
Federal law requires the Census Bureau to deliver redistricting data to the states by April 1, 2031, and Louisiana’s constitutional deadline means the legislature must finish reapportioning state legislative districts by the end of that year.11U.S. Census Bureau. Redistricting Data Program Management Congressional redistricting typically runs on a similar timeline, though no constitutional clock governs it the way Section 6 governs state legislative maps.
Prison gerrymandering will likely resurface. The Census Bureau counts incarcerated people at the facility where they are housed rather than their home communities, which inflates the population of districts containing large prisons and undercounts the communities inmates came from. The Bureau has confirmed it will keep this “usual residence” rule for the 2030 census, and Louisiana has no state law requiring an adjustment.
The Callais decision will shape everything else. The tightened Gingles framework makes it harder for challengers to compel the creation of majority-minority districts, shifting more discretion to the legislature. The Equal Protection Clause still bars race from being the predominant factor in district design, so mapmakers in 2031 will work in a narrower legal corridor: less room for race-conscious line-drawing, and an unchanged obligation to avoid discriminatory results.