Ensuring Fair Representation: The Constitutionality of Legislative District Creation Based on Population

The creation of a legislative district is not merely an act of political convenience—it is a constitutional exercise bound by specific population thresholds and territorial requirements. In Aldaba v. Commission on Elections (G.R. No. 188078, March 15, 2010), the Supreme Court, voting unanimously, denied with finality the COMELEC's motion for reconsideration and affirmed its earlier ruling that Republic Act No. 9591, which created a legislative district for Malolos City, was unconstitutional. The case clarifies the standards for measuring population compliance and reinforces the judiciary's power to review apportionment laws.

The Facts

Congress enacted RA 9591 creating a separate legislative district for Malolos City in Bulacan, carving it out from the province's First Legislative District. To justify the creation, Congress relied on a certification from Alberto N. Miranda, the Region III Director of the National Statistics Office (NSO), projecting that Malolos City's population would reach 254,030 by 2010.

Petitioners challenged the law before the Supreme Court, arguing that Malolos City failed to meet the constitutional requirement of at least 250,000 inhabitants. The COMELEC, as respondent, insisted that the reliability of the population indicators Congress used was a non-justiciable political question.

The Issue

The central issue was whether the creation of a legislative district for Malolos City under RA 9591 complied with Section 5(3), Article VI of the 1987 Constitution, which requires that cities must have at least 250,000 constituents to be entitled to representation in Congress, and that districts must comprise contiguous, compact, and adjacent territory.

The Ruling

The Supreme Court ruled that the law was unconstitutional on two grounds.

First, the population indicators Congress used were unreliable and non-authoritative. The Court applied the standards under Executive Order No. 135 (EO 135), which governs the issuance of population certifications. Under EO 135, certifications for intercensal years must be based on demographic projections declared official by the National Statistical and Coordination Board (NSCB), must be as of the middle of the year, and must be issued by the NSO Administrator or a designated certifying officer.

Miranda's certification failed all three requirements. Notably, using Miranda's own growth rate assumption of 3.78%, Malolos City's population as of August 1, 2010 would only reach 249,333—below the constitutional threshold. The Court also rejected alternative population indicators, including a preliminary census report, a certification from the Malolos City Water District, and a certification from the Liga ng Barangay, finding that none qualified as authoritative under EO 135.

Second, the creation of the district violated the territorial contiguity requirement. Carving Malolos City from the First Legislative District left the municipality of Bulacan isolated from the rest of the district's geographic mass. The Court noted that Congress could have included the municipality of Bulacan in Malolos City's district to achieve a contiguous and compact configuration.

Justiciability of Apportionment Laws

The Court firmly rejected the COMELEC's argument that the reliability of population data is non-justiciable. Citing the 1961 case of Macias v. COMELEC, the Court held that the constitutionality of legislative apportionment acts is a judicial question. To hold otherwise would render meaningless the constitutional limitation on population requirements and reduce the Court to "rubberstamping laws creating legislative districts no matter how unreliable and non-authoritative the population indicators Congress used."

Practical Takeaways

• Population data must meet official standards. Congress cannot rely on projections or certifications that fail to comply with EO 135's requirements for authoritative population data from the NSO or NSCB.
• The 250,000 population threshold is a hard constitutional requirement. A city is entitled to its own legislative district only if it breaches this mark before the immediately following election.
• Contiguity matters. Legislative districts must comprise contiguous, compact, and adjacent territory "as far as practicable." Congress must explore alternatives, even unorthodox ones, to satisfy this requirement.
• Apportionment laws are reviewable. Courts will scrutinize laws creating legislative districts, including the quality of the population data Congress used, to ensure compliance with constitutional limitations.
• Non-NSO certifications are suspect. Population data gathered incidentally by utilities or local organizations lacks the scientific rigor required for legislative apportionment decisions.

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