Texas Redistricting

Legal Requirements

Summary of Legal Requirements

Legal Requirement for the Process

The following is a brief discussion of basic legal requirements relating to redistricting. For more information on the legal requirements, see State and Federal Law Governing Redistricting in Texas. This discussion does not include judicial redistricting, which is substantially different from redistricting of districts for legislative bodies.


Requirement to Redistrict

The federal constitution calls for reapportionment of congressional seats according to population from a decennial census (Section 2, Article I). Reapportionment is the division of a set number of districts among established units of government. For example, the 435 congressional seats are reapportioned among the 50 states after each decennial census according to the method of equal proportions. The boundaries of the congressional districts are then redrawn by state legislatures in accordance with state and federal law.

Redistricting is the revision or replacement of existing districts, resulting in new districts with different geographical boundaries. The basic purpose of decennial redistricting is to equalize population among electoral districts after publication of the United States census indicates an increase or decrease in or shift of population.

The Texas Constitution requires the legislature to redistrict Texas house and senate seats during its first regular session following publication of each United States decennial census (Section 28, Article III). After each census, State Board of Education seats also must be redistricted to bring them into compliance with the one‐person, one‐vote requirement.

Basic Requirements

Two primary requirements govern all redistricting decisions in the state. First, districts of a given type (senate, house, congressional, State Board of Education (SBOE)) must have equal or nearly equal populations, and second, districts must be drawn in a manner that neither has the purpose nor will have the effect of denying or abridging the right to vote on the basis of race, color, or language group. These requirements are based in the Fourteenth Amendment to the U.S. Constitution (the Equal Protection Clause), the Fifteenth Amendment (prohibiting voting discrimination based on race), the federal Voting Rights Act of 1965, and, for congressional districts, Section 2, Article I, United States Constitution.

"The conception of political equality from the Declaration of Independence, to Lincoln's Gettysburg Address, to the Fifteenth, Seventeenth, and Nineteenth Amendments could mean only one thing—  one person, one vote."

U.S. Supreme Court Justice William O. Douglas, Gray v. Sanders, 372 U.S. 368 (1963)
Congress building represents the Tx Senate and House

The first question that must be answered about redistricting is exactly how equal the populations of districts must be. A Texas case that reached the U.S. Supreme Court in the 1970s (White v. Regester, 412 U.S. 755 (1973)) set the basic standard for the maximum acceptable population deviation for state legislative districts. Under that standard, the combined deviation of the most populous district and the least populous district from the ideal district population may not exceed 10 percent, and all the other district populations must fall within that narrow range. "Ideal district population" is the population a district would have if all districts in a plan have equal populations, and it is determined by dividing the total state population by the number of districts in the plan. Exceptions to the 10 percent deviation limitation have been allowed if based on consistent application of rational state policy such as the preservation of whole counties. In some cases, plans with districts within the 10 percent limitation have been held invalid if the population deviations show a pattern of discrimination. The same standard applies to districts for the SBOE. A stricter one‐person, one‐vote standard applies to congressional redistricting.


The federal constitutional and statutory provisions on redistricting, the differing provisions of the Texas Constitution relating to legislative districts, and numerous federal and state court cases on the issue result in somewhat different requirements for different types of districts. The following sections briefly describe redistricting requirements specific to each type of district for which the Texas Legislature is primarily responsible.

Senate District Requirements

Section 25, Article III, Texas Constitution, requires the Texas Senate to be elected from single‐member districts and each senate district to be composed of contiguous territory.

Section 28, Article III, Texas Constitution, requires the legislature to redistrict state senate districts during the first regular session following publication of the decennial census. If the legislature fails to do so, the redistricting task falls to the Legislative Redistricting Board.

House District Requirements

Section 26, Article III, Texas Constitution, as applied by the state and federal courts in conjunction with federal law, requires that house districts be apportioned among the counties according to the federal census population and the following rules:

In practice, it is sometimes impossible to draw a statewide plan that completely satisfies these rules while maintaining districts with equal populations. The Texas courts have allowed a house plan to violate these rules to the extent necessary to draw a plan that complies with the one‐person, one‐vote requirement.

Section 28, Article III, Texas Constitution, requires the legislature to redistrict state house districts during the first regular session following publication of the decennial census. If the legislature fails to do so, the redistricting task falls to the Legislative Redistricting Board.

Congressional District Requirements

The number of seats in the U.S. House of Representatives apportioned to each state is determined after each decennial census by a mathematical formula set by federal law. Unless a state's constitution provides otherwise, each legislature has the authority to draw its state's congressional district boundaries. No Texas constitutional or statutory provisions address congressional redistricting. As a practical matter, the legislature must draw districts for the congressional seats apportioned to Texas before the candidates' filing period for the first general election following the decennial census. Unlike legislative redistricting, congressional redistricting does not come within the authority of the Legislative Redistricting Board if the legislature fails to enact a valid plan during the regular session that is meeting when the decennial census is published. The issue may be taken up in a subsequent special session of the legislature or, if the governor does not call a special session, the districts may be drawn by a state or federal court.

Federal law allows less population deviation for congressional districts than for legislative districts, requiring congressional districts to be as equal in population as practicable. In congressional districts, each deviation from the ideal district size must be justified on the basis of a rational state policy or be found to be unavoidable despite a good faith effort to draw districts with equal population, Karcher v. Daggett, 462 U.S. 725 (1983). As a result, congressional districts are usually drawn to be almost exactly the same in population.

State Board of Education District Requirements

Section 7.101, Education Code, establishes the composition of the State Board of Education (SBOE). In 1984, the 68th Legislature, 2nd Called Session, set the number of districts at 15.

No state statute requires redistricting of the SBOE districts at a particular time, although the statutes governing the board assume the districts will be redrawn after each federal decennial census. See Section 7.104, Education Code.

Judicial District Requirements

Texas law states that the purpose of reapportionment of the judicial districts for the district courts is to promote "prompt and efficient" administration of government by equalizing the "judicial burdens" of the district courts. This differs from the purpose of redistricting representative districts, which is to equalize the populations of the districts. Caseloads and a number of other variables, some of which are difficult to quantify, may be factored into the measurement of "judicial burden." Judicial districts are not covered by the one‐person, one‐vote requirement and may have whatever populations the legislature considers appropriate.


The Texas Legislature may revise the judicial districts at any regular or special session. The Texas Constitution requires the Judicial Districts Board (JDB) to make a statewide reapportionment of judicial districts if the legislature does not do so by June of the third year following the federal decennial census. If the JDB fails to do so by August of that third year, the responsibility falls to the Legislative Redistricting Board.

The boundaries of the state's courts of appeals districts are determined solely by the legislature and are not required to be redrawn at any particular time.