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Ilagan, officially the City of Ilagan (Ibanag: Siudad nat Ilagan; Ilocano: Siudad ti Ilagan; Filipino: Lungsod ng Ilagan), is a component city and capital of the province of Isabela, Philippines. According to the 2024 census, it has a population of 164,020 people, making it the most populous city in the province and second in the region after Tuguegarao City. As of 2025, it also had the highest number of voters in the province, with 105,526 voters.

It is dubbed as the corn capital of the Philippines, and the home of the country's largest armchair locally known as butaka.

Etymology

According to Fr. Julian Malumbres, Ilagan derived its name from the word laga, an Ibanag word for "smallpox", of which there was an outbreak during the town's founding in 1686.

History

Early history

The town was then known by its native Gaddang settlers as Bolo during the pre-Spanish conquest era. It was one of the populous settlements during that period and the site of the vast tobacco plantation in the region making it one of the most important economic areas in northern Luzon.

Spanish colonial era

In 1581, Governor-General Gonzalo Ronquillo de Peñalosa sent Capt. Juan Pablo Carreon to explore Cagayan Valley as well as to establish missions. Among the Spanish missionaries who penetrated deeply into the region was Pedro Jimenez, who founded Ilagan.

The town of Bolo was founded by the Dominicans in 1619 in honor of Saint Ferdinand of Castile. The old Bolo was situated on the western side of Cagayan River in what is known today as Naguilian-Baculod. The cultural shock brought by the dominating social and economic regulations introduced by the Spanish authorities propelled the natives to dissent in the Mallig and the Ilagan-Tumauini territories in what was known as the Gaddang Revolution. The natives abandoned their settlement after burning their church and houses until 1622 when the Spanish government pardoned and exempted them from paying tribute within three years. After the Gaddang revolt, the natives re-established their settlement upon the efforts of Fr. Pedro Jimenez in 1678 on the east side of the river thereby giving the legendary name for Ilagan which is the reverse of the word nagali meaning move or transfer. The Dominicans accepted the settlement as an ecclesiastical mission given the name San Fernando de Ilagan in honor of its patron, Saint Ferdinand of Castile.

Foundation

On May 4, 1686, Ilagan was founded and missionaries converted the natives to Catholicism. Ilagan was made the capital town of Cagayan Valley when Brig. Manuel Sanchez Mira was then the governor of the whole territory.

In 1763, Ilagan was the scene of the revolt led by Dabo and Juan Marayag against the collection of tribute, the enforcement of tobacco monopoly committed by the friars during the Spanish colonization.

On May 1, 1856, Ilagan became the capital town when Isabela de Luzon was founded.

American colonial era

Present-day Ilagan is an area that was detached from the old province of Nueva Vizcaya.

Geography

The city is located in the central portion of the province of Isabela. It is bounded by nine municipalities: on the north by the municipalities of Divilacan, Tumauini, and Delfin Albano; on the west by the municipality of Quirino; on the east by the municipalities of Divilacan and Palanan, and the Pacific Ocean; and on the south by the municipalities of Gamu, Naguilian, Benito Soliven and San Mariano.

With a total land area of 116,626 hectares (288,190 acres), it is the largest city on the island of Luzon and the fourth largest city in land area in the Philippines, after Davao City, Puerto Princesa, and Zamboanga City.

Ilagan is situated 437.52 kilometers (271.86 mi) north of capital Manila (linked by a national highway via Santa Fe, Nueva Vizcaya).

Barangays

Ilagan City is politically subdivided into 91 barangays, the highest number of barangays in the province.  Each barangay consists of puroks and some have sitios.

Currently, 13 barangays in the city are considered urban (highlighted in bold). Barangays are grouped into four clusters, namely Poblacion, Eastern, Western, and San Antonio.

As of December 31, 2022, the following barangays are considered urban: Alibagu, Baculud, Bagumbayan, Baligatan, Calamagui 1st, Calamagui 2nd, Centro Poblacion, Guinatan, Imelda Bliss Village, Osmeña, San Vicente, Santa Barbara, and Santa Isabel Sur.

Climate

Ilagan has a tropical savanna climate (Köppen Aw) with consistently hot temperatures year-round, a dry season from January to April, and a wet season from May to December.

Land

Of the total 1,166.26 km2 land area of Ilagan; 31% are agricultural, 36% are forest areas, and the remaining 33% are built-up areas and open grassland areas that are available for industrial, commercial and residential uses.

Demographics

Ethnicity

Ilagueños today reflect a combination of indigenous, Chinese, and Hispanic descent. The core community was composed of tribes notably the Agta, Ibanag, Gaddang, Yogad, and Kalinga which mirrors the habitation of the Philippines believed to have started 26,000 years ago with various strains of Aetas, then Indonesians coming 5,000 years ago and the Malays in droves starting 200 years B.C. up to 1500 A.D. Trade and cultural relations with Chinese preceded the 16th-century incursion of the Spaniards. Ilocanos who already developed their own distinct traits were recorded to have migrated massively in the 19th century owing to the accessibility of the land and vast opportunities in the area straddling the present-day provinces of Cagayan and Nueva Vizcaya. It was proclaimed a province by a Royal Decree and named Isabela de Luzon on the first day of May in 1856.

Languages

There are three native languages in Ilagan: Ibanag, Ilocano, and Tagalog, which make it a multilingual city. English is used primarily in communication for government publications, local newsprints, road signs, and commercial signs, and in doing official business transactions in the city.

Population

As of the 2024 census, the population was 164,020 people, with a density of 140/km2 or 360/sq mi. Imelda Bliss Village remains the most populous barangay with 7,961 people while Carikkikan Sur is the least populous with just 223 people.

The rapid increase of the population in Ilagan is attributed to the current growth of economic activities especially in the sectors of Commerce, Industry, Agriculture, and Housing. Ilagan is one of the emerging cities in the Philippines with more than 100,000 residents. Statistics from the Philippine Statistics Authority show that Ilagan had a population 131,24311 in 2007, which increased to 135,174 people in the 2010 census making Ilagan as the most populous city in the province of Isabela and the second in Cagayan Valley after Tuguegarao.

Religion

Catholicism

Ilagan's population is predominantly Roman Catholic. The Diocese of Ilagan has 39 catholic churches all over the province of Isabela.

Economy

At present, Ilagan has been one of the fastest-growing economies in the province of Isabela as well as in the whole Cagayan Valley over the past years. The city is the primary growth center and investment hub of the region due to the rapid commercialization and stabilization of the different sectors involved in its economy.

The transformation of Ilagan into a fast-growing city in Cagayan Valley became evident upon the assumption into office of then Mayor Josemarie L. Diaz, the re-structuring of the economic landscape of the city and the eventual transformation of its business climate into a business-friendly environment successfully lured multi-national companies in investing their capitals into its market. The economic boom began to engulf Ilagan with the entry of eight banks and financial institutions in just several months.

The Local Government of Ilagan responded positively to these developments by the enactment of legislative measures including the provision of the Investment Incentive Code which provided for tax incentives to investments. These measures eventually opened the floodgates for big investments to enter the local market that included the establishments of malls like the Xentro Mall (formerly called Northstar Mall) and Talavera Square Mall.

There are also thousands of commercial establishments composed of distributors, retail and wholesale. Pawnshops, lending companies, insurance agencies, cooperatives, and other financial institutions are spread all over the city.

Agriculture, fishery, and animal industry

Agriculture and fishery remain the main backbone of Ilagan's economy. There are almost 23,803 hectares that are cultivated land and 314 hectares are utilized for fish culture. However, the suitable farm area of Ilagan is 32,153.19 hectares with potential for crops, livestock, and fish production. This figure shows that a significant percentage (24.99%) is not being fully utilized for agricultural production leaving them idle and underutilized.

Most of the industries in the city are agri-based. For the last ten years, there has been a great number of local investment in poultry and hog raising.