Legislative Apportionment vs Local Autonomy: When a Plebiscite Is Not Required

The Supreme Court's 2008 decision in Bagabuyo v. Commission on Elections (G.R. No. 176970) settled an important question about the boundary between legislative power and local autonomy: when Congress reapportions a city's legislative districts, must the voters approve through a plebiscite? The Court answered no, drawing a clear line between legislative apportionment—which concerns political representation—and the creation or division of local government units, which requires popular consent.

The Case: Cagayan de Oro's Two Districts

Republic Act No. 9371 increased Cagayan de Oro City's legislative district from one to two. The law divided the city's barangays between the two districts, with each district electing its own representative to Congress and eight members of the Sangguniang Panglungsod. The COMELEC issued Resolution No. 7837 to implement the law.

Petitioner Rogelio Bagabuyo challenged the law's constitutionality, arguing that the reapportionment effectively divided the city as a local government unit, and that the Constitution requires a plebiscite before any such division can take effect.

The Plebiscite Requirement Under Article X

The Constitution's Article X, Section 10 provides that no province, city, municipality, or barangay may be created, divided, merged, abolished, or have its boundary substantially altered, except in accordance with the Local Government Code and subject to approval by a majority of votes in a plebiscite in the political unit directly affected.

The Court explained that this requirement applies only to local government units—political and corporate entities with their own legal personality, chief executives, and governing bodies. A legislative district, by contrast, is not a corporate unit. It has no chief executive, no legal personality, and exists solely to delineate which voters elect a particular representative.

Legislative Apportionment Under Article VI

Article VI, Section 5 of the Constitution governs legislative apportionment. Its concern is political representation—ensuring that districts are apportioned according to population on a uniform and progressive ratio, and that each district comprises, as far as practicable, continuous, compact, and adjacent territory.

The Court traced the historical roots of these two provisions. Legislative apportionment has existed since the Philippine Organic Act of 1902 and was never subject to a plebiscite requirement. The plebiscite requirement for local government units was only constitutionally enshrined in the 1973 Constitution. The two concepts developed on separate tracks.

R.A. No. 9371 Was Purely Reapportionment

Examining R.A. No. 9371, the Court found it was "purely and simply a reapportionment legislation." The law did not divide Cagayan de Oro as a political and corporate entity. The city remained a single unit; its administration was not divided along territorial lines, and its territory remained whole and intact. The law merely added another legislative district and delineated the city into two districts for representation purposes.

The Court noted that the additional Sangguniang Panglungsod seats came from a separate law—R.A. No. 6636—not from the reapportionment law itself. Neither law divided the city territorially or as a corporate entity; rather, the effect was to enhance voter representation.

Equality of Representation

The petitioner also argued that the reapportionment violated equality of representation because the districts had unequal numbers of registered voters. The Court clarified that the constitutional basis for districting is the number of inhabitants, not registered voters. Using census data, the Court found the districts had populations of 254,644 and 299,322 respectively.

The Constitution does not require mathematical exactitude in districting. It requires only that each city with at least 250,000 inhabitants have one representative, and that districts comprise contiguous, compact, and adjacent territory as far as practicable. Minor population disparities are acceptable.

Practical Takeaways

• Legislative reapportionment does not require a plebiscite. Congress may reapportion legislative districts under Article VI, Section 5 without voter approval.
• A plebiscite is required only for creating, dividing, merging, or abolishing local government units or substantially altering their boundaries, under Article X, Section 10.
• The distinction matters: a legislative district is a representative unit, not a corporate unit. It has no chief executive and no legal personality.
• Population, not registered voters, is the basis for districting. Minor disparities between districts do not violate the Constitution's equality of representation requirement.
• Courts will respect legislative policy choices in drawing district lines, as long as constitutional standards are met.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.