Population Projections and Legislative Districts: The Malolos Case

The Constitution gives every city with at least 250,000 people the right to its own representative in Congress. But how is that population counted? A 2010 Supreme Court decision answers this question, striking down a law that created a separate legislative district for Malolos City, Bulacan, based on a flawed population projection. The case clarifies the strict rules that Congress must follow when creating legislative districts and the Court's power to review such laws.

The Case: Republic Act No. 9591

In 2009, Congress passed Republic Act No. 9591, which created a separate legislative district for Malolos City. Before this law, Malolos was part of Bulacan's First Legislative District, together with the municipalities of Hagonoy, Calumpit, Pulilan, Bulacan, and Paombong.

The law relied on a certification from a Regional Director of the National Statistics Office (NSO) stating that Malolos' projected population "will be 254,030 by the year 2010." This projection was based on a population growth rate of 3.78% observed between 1995 and 2000.

Petitioners, who were taxpayers and residents of Malolos City, challenged the law before the Supreme Court. They argued that the city did not meet the constitutional minimum population of 250,000 required for a city to have its own legislative district.

The Issue

The central question was whether Malolos City had a population of at least 250,000—whether actual or projected—to justify the creation of a legislative district in time for the May 2010 elections. If not, the law creating the district would be unconstitutional.

The Ruling: A Flawed Certification

The Supreme Court granted the petition and declared Republic Act No. 9591 unconstitutional. The Court ruled that the NSO certification relied upon by Congress had no legal effect for several reasons.

First, the certification was issued by a Regional Director, but under Executive Order No. 135, only the NSO Administrator or a designated certifying officer can issue certifications based on population projections. There was no showing that the Regional Director had been designated for this purpose.

Second, the demographic projections were not declared official by the National Statistics Coordination Board (NSCB), as required by the same Executive Order. Third, the certification violated the requirement that intercensal population projections be made "as of the middle of every year."

Most importantly, the Court found that even using the certification's own growth rate of 3.78% per year, Malolos' population would only reach about 241,550 in 2010—not the claimed 254,030. The 2007 Census placed the city's population at 223,069, which would grow to only about 248,365 by August 2010, still below the 250,000 threshold.

The "Immediately Following Election" Rule

The Court also emphasized a key rule from the Ordinance appended to the 1987 Constitution. A city that attains a population of 250,000 is entitled to a legislative district only in the "immediately following election" after reaching that population. The exact provision containing this rule is not available in the ASG law library, but the Supreme Court's decision in this case clearly applies this standard.

This means the city must first meet the population threshold, and only then can it claim a district in the next election. Since there was no official record that Malolos had attained or would attain 250,000 people before the May 2010 elections, it was not qualified to have its own district.

The Court's Power to Review

The Office of the Solicitor General argued that Congress' choice of how to determine population compliance was a political question that the Court should not review. The Court rejected this, holding that questions about compliance with constitutional standards are justiciable. The Court has the duty to determine whether there has been grave abuse of discretion by any branch of government.

The Court also cited earlier jurisprudence, including a 1961 case, to support the principle that district apportionment laws are subject to judicial review. The aim of legislative apportionment is to equalize population and voting power among districts.

Practical Takeaways

• Population projections must follow strict rules. For a city to qualify for its own legislative district, any population projection must be officially declared by the National Statistics Coordination Board and certified by the NSO Administrator or a designated officer.
• The 250,000 population threshold is a hard requirement. A city must actually reach this number before it can claim a district in the immediately following election.
• Congressional findings are subject to judicial review. The Supreme Court will examine whether Congress complied with constitutional standards when creating legislative districts.
• Projections must be credible and consistent. A projection that contradicts its own data—or official census figures—will not be accepted as valid basis for legislation.
• The "as far as practicable" rule on district contiguity does not override the population requirement, though it remains a relevant standard in apportionment cases.

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