Agoo ([aˈgɔʔo]), officially the Municipality of Agoo (Ilocano: Ili ti Agoo; Pangasinan: Baley na Agoo; Filipino: Bayan ng Agoo), is a 1st class municipality in the province of La Union, Philippines. According to the 2020 census, it has a population of 66,028 people.

Agoo is 235 kilometres (146 mi) from Metro Manila, 34 kilometres (21 mi) from the provincial capital San Fernando, and 52 kilometres (32 mi) from Baguio via Marcos Highway.

The name agoo is usually attributed to "aroo" a pine-like evergreen tree (Casuarina equisetifolia or whistling pine) that thrived in the western coast during the pre-Spanish period.

Agoo's administrative dates back further than most Philippine municipalities, with the town being established within the same decade that the Spanish colonizers arrived on the Island of Luzon. The history of the settlement now known as Agoo dates back even further, with both documentary and artifactual evidence supporting the assertion that it was a major port of call for foreign traders before it was formally established by the Spaniards.

Before the arrival of European colonizers, Agoo, a trading port of Luyag na Caboloan (modern day-Pangasinan), was already a coastal maritime trading center for Northwestern Luzon, because its coast was shaped in such a way that it was a good harbor for foreign vessels coming into Lingayen Gulf. Gold mined from the Cordillera Mountain Range, coming down from the Aringay-Tonglo-Balatok gold trail, was traded in Agoo as well as its neighbor settlement in Aringay.

Evidence of trade between Agoo and China has been excavated in the form of porcelain and pottery pieces unearthed at the site of the Catholic church during its renovation, - which are now kept in the Museo de Iloko.

Japanese fishermen eventually established their first settlement in the Philippines at Agoo, passing on their fishing skills and technologies to the local populace.

By the time the Spanish first arrived to colonize Luzon, they noted that Agoo was inhabited by people of the "same race as those of Pangasinan," and Agoo was originally made part of that Pangasinan province until the Spanish authorities decided to create a new province, La Union, bringing together towns from Pangasinan and Ilocos Sur.

In 1572, Juan de Salcedo, fresh from his conquest of Southern Luzon, was ordered by Miguel Lopez de Legazpi to explore Northern Luzon and "pacify the people in it".

In June 1572, he was traversing the Angalakan River, when he saw and attacked three Japanese ships. When they fled, Salcedo followed them until they landed at a Japanese settlement. After paying tributes, the Japanese were allowed to remain. These Japanese would leave when the port of Agoo was later closed, but not without first teaching the natives their methods of fish culture, rice cultivation, deerskin tanning, duck breeding, and weapons manufacturing.

A permanent settlement was established in Agoo in 1578 when two Franciscan Missionaries, Fray Juan Bautista Lucarelli of Italy and Fray Sebastian de Baeza of Spain, constructed a thatch and bamboo church in honor of Saint Francis of Assisi. Agoo encompassed a vast land area that spanned the modern-day towns of Rosario, Santo Tomas, Tubao, Pugo, Aringay, Caba, Bauang, and the place called "Atuley" or present-day San Juan. Agoo became the center of the campaign of pacification and conquest, not only of the surrounding towns that would later become La Union but of the mountain tribes in the Cordilleras as well.

The two missionaries formally proclaimed Agoo as a civic unit. naming it after the river along whose banks it was built. At the time, the riverbank was forested with pine-like trees locally called "aroo" or "agoho" (Casuarina equisetifolia, or Whistling Pine).

During the early years of the Spanish colonial period, Agoo continued to be an important point of trade with Japan. Miguel De Loarca referred to Agoo as "El Puerto de Japon" - the Japanese Port.

Rosario Mendoza-Cortes, in her book "Pangasinan 1572-1800" notes that Agoo was the region's primary port of call for Japanese and Chinese traders - with the only other contender for the honor being Sual, Pangasinan. This was because there was a Japanese colony there. After all, traders at Agoo would have access to a greater number of people, and it was nearer to China and Japan. The main product traded from the area was the deer pelt, which was shipped to Japan.

Agoo's role as a port deteriorated when the Spanish closed the Philippines to foreign trade. When foreign trade was allowed again, the shape of the gulf had changed and it was thus Sual that became the dominant port.

Most of the town's early development can be attributed to the efforts of the Augustinian Order. They took over from the Franciscans and administered the town off and on throughout the Spanish occupation until the secular priests took over in 1898.

They changed the town's patron saint to Santa Monica. They established a school where reading, writing, industrial works, and catechism were taught. They relocated the town center, laid out the streets and public buildings, and established roads leading to the nearby towns.

To facilitate the construction of churches, public buildings, and bridges, they taught the people brick and lime making, brick-laying, and stone-quarrying. They introduced the "moro-moro", the singing of "pasyon", new farm implement, and new plants.

Father Aquilino Garcia constructed a church, and by the end of the 15th century, the image of Nuestra Señora de Caridad (Our Lady of Charity) was installed in it. This church was destroyed in 1796 and a new one was built when the original settlement was moved to what has ever since been the town center. The church was then claimed to be the largest and grandest in northern Luzon during that time. Ruins are scattered throughout the town's center and some are visible at this point.

In 1661, Andres Malong of Pangasinan failed to recover La Union from the Spaniards after the Battle of Agoo.

On October 29, 1849, Governor General Claveria issued a promovido to fuse the Pangasinan-Ilocos-Cordillera areas into La Union. On March 2, 1850, Governor General Antonio Maria Blanco signed the Superior Decreto of La Union (34th province from Cebu-1565), with Captain Toribio Ruiz de la Escalera as the first Gobernador Military y Politico. Isabella II of Spain decreed the province's creation on April 18, 1854.

The new province comprised the north-western towns of Pangasinan and the towns of Ilocos Sur south of the Amburayan river. Agoo was the oldest town to be integrated and was listed as having a population of 6,936 people.

Agoo, along with the towns of Caba, La Union and Bauang, La Union were the first places the Japanese invasion force sought to control during the main effort to capture Luzon at the beginning of World War 2 - now known as the Japanese Invasion of Lingayen Gulf. Capturing the three towns which were connected by a high quality road, but protected on one side by the ocean and the other by the sea, meant that the Japanese forces were easily able to establish a secure beachhead. Once they had done so, they launched attacks against defense forces at San Fernando, La Union and Rosario, La Union, and from there they deployed southwards across the plains of Pangasinan and Tarlac to take Fort Stotsenburg in Pampanga, then Bulacan, and finally Manila.

In the early morning of 22 December 1941, Agoo was one of three beachheads taken by the invasion force of General Masaharu Homma during the Japanese Invasion of Lingayen Gulf.

The Japanese' 47th Infantry Regiment under the command of Col Isamu Yanagi, accompanied by the 4th Tank Regiment and supported by a flotilla of the Imperial Japanese Navy led by Vice Admiral Kenzaburo Hara (consisting of the light cruiser Natori , destroyers Fumizuki, Nagatsuki, Satsuki, Minazuki, Harukaze, Hatakaze, three minesweepers, six anti-submarine craft and six transports) was supposed to land on the beaches of Agoo beginning 5:00 A.M. on December 22, 1941, having left Takao on Taiwan the evening of December 18.

The Japanese 47th Infantry and 4th Tank Regiment were confronted by heavy weather, however, and were thus delayed and dispersed. They landed at about 7:30 A.M. on a four-mile stretch of beach all the way from Agoo to just north of Damortis.

Agoo is thus recorded in WWII annals as one of the Japanese staging points for the Battle of Rosario.

The beginning of the 1970s marked a period of turmoil and change in the Philippines because Ferdinand Marcos had used foreign debt to fund too many public works projects just before his 1969 reelection campaign, which led to the 1969 Philippine economic crisis and the First Quarter Storm protests. La Union residents mostly did not speak up about the economic stresses they were experiencing, but when Marcos declared martial law in 1972, Agoo was included with the rest of the country.

Marcos' efforts to consolidate political power did not get much resistance in the La Union, including Agoo, since Marcos' use of violent methods for stifling dissent thus mostly took place in other provinces, such as nearby Abra, Kalinga, and Mountain Province. Marcos also had strong political ties to La Union, notably Jose D. Aspiras whom he appointed as Tourism Minister. He also allowed the powerful family factions (which had dominated La Union politics since before the American colonial era) to stay in place.

But there were some Agoo natives, such as then-Davao Archbishop Antonio L. Mabutas, who spoke against the human rights abuses during martial law. Since Bishop Mabutas was in Davao at the time, he was aware of human rights abuses in that city, particularly the torture and killings of church workers. The pastoral letter he wrote against Martial law, "Reign of Terror in the Countryside," is notable for having been the first pastoral to be written against Marcos' martial law administration, and even doubly so because Mabutas was considered a conservative within the Catholic church hierarchy in the Philippines.

On July 23, 1945, the Municipal government, then led by Mayor Miguel Fontanilla, established South Provincial High School in response to education-oriented citizen Ramon Mabutas' calls for the establishment of a public high school. South Provincial High School turned Agoo into a center of education for Southern La Union and became one of the constituent state-run schools that were combined by Presidential Decree 1778 to create the Don Mariano Marcos Memorial State University in 1981.

After the February 1986 People Power Revolution, President Corazon Aquino placed the Philippines under a revolutionary government until the 1987 Constitution of the Philippines could be ratified. During this time, the Municipality of Agoo was placed under the administration of OIC Mayor Antonio Q. Estrada.

At 4.26 P.M. on July 16, 1990, Agoo was hit by the 1990 Luzon earthquake, and was one of the most severely affected locales.

The Basilica Minore of Our Lady of Charity was badly damaged, and the bell tower which was then the only remaining structure from the 1893 church, crashed completely. The Agoo municipal building collapsed completely, killing numerous citizens who were inside because they were in line to pay in time for the national income tax deadline for that quarter. Numerous tombs in the municipal cemetery were fractured open.

The town gained media attention in the early 1990s for the alleged Marian apparitions of the Blessed Virgin Mary to Judiel Nieva. Nieva reported seeing the Virgin Mary, popularly known as Our Lady of Agoo atop a Guava tree, a statue weeping with blood became highly sensationalized. Religious pilgrimages among Filipino Catholics increased by the millions as people flocked to see the phenomenon. The alleged apparition and healing events came into the attention of the Catholic Bishops' Conference of the Philippines, who in turn began an investigation and later released an ecclesiastical ruling that the apparitions were non-supernatural in origin in 1993.

On June 11, 2014, then-representative Eufranio Eriguel filed House Bill 4644 to establish the first city in the second district by merging the municipalities of Agoo and Aringay. The bill was co-authored by La Union first district Rep. Victor Ortega and Abono party-list Rep. Francisco Emmanuel Ortega III, and was deemed necessary because neither Aringay nor Agoo alone could meet the requirements to create a Philippine city: a population of 150,000; an annual income of P100 million minimum a year; and a land area of 100 square kilometers. (As of 2014, the national census showed that Agoo and Aringay have about 65,000 and 47,500 residents, respectively. Agoo posted more than P90 million, and Aringay made P15,000 million in annual earnings, respectively)

The proposed city would have two districts under a city mayor and city vice mayor along with 14 councilors in the Sangguniang Panlungsod, new positions for which the former municipal officials could run despite having the terms limits of their offices.

The proposed bill sparked protests from the people of both Agoo and Aringay who did not want the merger because it would subject them to the same high local taxes as Agoo and because of concerns that Agoo and Aringay would lose their cultural identities. The proposed merger did not push through within term of the 16th Congress.

Since 2010, either the Municipality Agoo has been regularly declared an election hotspot due to incidences of violence during national and local election periods. Major incidents include the murder of former Tubao Vice Mayor Lazaro Gayo outside his law office near Agoo's Municipal Hall, and an alleged assassination attempt on Tubao Mayor Dante Garcia in the same year; and an alleged assassination attempt on former Congressman Eufranio Eriguel in 2016.

Media attributed the violence to "intense rivalry" between incumbent Congressman Eufranio Eriguel and his 2010 opposing candidate, former Rep. Thomas Dumpit Jr., and later to "clashes between the followers" of Congressman Eriguel and his 2013 opponent, former Army General Mario Chan.

In 2013, the declaration of the towns Tubao, Agoo, Caba, and Aringay as election hotspots compelled the Philippine National Police to temporarily remove the police chiefs of the four towns during the election period, a decision which was protested by incumbent politicians in both towns, including then-Congressman Eriguel and his wife, then-Mayor Sandra Eriguel.

Also during the 2010s, a number of drug-related incidents in Agoo came to national attention. This resulted in the sacking of the police chief of Agoo, along with those of the Southern La Union towns of Bauang, Naguilan, and Tubao.

On August 16, 2016, former Congressman Eriguel was included by Philippine President Rodrigo Duterte as one of the local government officials and legislators allegedly involved in illegal drug trade in his "I am sorry for my country" speech. Eriguel and a number of other Southern La Union politicians denied these allegations.

On May 12, 2018, Eriguel and two others were gunned down by unknown assailants in an ambush during an event for the 2018 Barangay elections.

In 2021, the Philippines' Department of Environment and Natural Resources (DENR) established the Agoo Eco-Park in a 10,774.68 hectare area (of which 3% is land in Barangay Sta Rita West, while the rest is part of the marine ecosystem) has already been designated designated as a Protected Landscape and Seascape as part of the Agoo–Damortis Protected Landscape and Seascape (ADLPS) in 2018, and 2021 marked the beginning of systematic reforestation efforts under the national greening program (NGP) which the national government first launched in 2011.

A 2023 vegetation survey of the land area alone found thriving populations of 17 plants, or which 7 were native and 4 were naturalized while only 6 were exotic, cultivated or unclassified. Philippine Native trees found in the survey included the Mangrove pagatpat (Sonneratia alba), Ayangile (Acacia confusa), Aroo (Casuarina equisetifolia), Talisay (Terminalia catappa L.) and Bakawan lalaki (Rhizophora apiculata) and native undergrowth species included Bagaswa (Ipomoea pes-caprae L.), Kawad-kawaran (Cynodon dactylon) and Putok-putok (Ruellia tuberosa). Of these, the Mangrove pagatpat was the single most common species, and was identified as one of three species “likely to influence the growth and survival of other species” - the other two being the Ayangile, and the Aroo tree after which the town of Agoo is named.

After local tensions leading up to the 2022 Philippine local elections, Frank Ong Sibuma was elected as the Municipal Mayor of Agoo. Sibuma's candidacy was questioned on technicalities regarding his residency, and a long dispute had to be resolved by the Supreme Court of the Philippines in a January 24, 2023 decision which upheld Sibuma's election.

Agoo and La Union are part of the Ilocos Region, which is located on the narrow plain between the Cordillera Central and the South China Sea. Agoo itself is one of the southern municipalities and is bounded on the north by Aringay, on the east by the municipality of Tubao further up the foothills of the Cordilleras, and on the south by Santo Tomas. Agoo's western shores consist of a long beach facing Lingayen Gulf and South China Sea.

The Agoo River, which is sometimes referred by the locals as the Principe River after the Taytay Principe Bridge which traverses it along the main highway, flows through the town from uphill in the east to where it meets the South China Sea in the west.

Agoo is divided into 49 barangays. Each barangay consists of puroks and some have sitios.

According to findings of the Philippine Rice Research Institute, Agoo's land consists mostly of the San Manuel (a dark grayish brown sandy loam characterized by medium compactness and a Ph ranging from highly acidic to slightly alkaline), Maligaya (dark grayish brown clay loam with course fragments of soft powdery red and black concretions, characterized by medium compactness and a neutral to slightly alkaline Ph), Bauang (dark grayish brown clay loam with course fragments of highly weathered stratified shales and sandstones characterized by strongly acidic to slightly acidic Ph), and Annam (brown clay loam with course fragments of partially and highly weathered rock or gravel and yellowish brown Iron and Magnesium concretions, characterized by an extremely to slightly acidic Ph) type soils.

Population census of Agoo

Year	Pop.	±% p.a.
1903	10,653	—
1918	12,517	+1.08%
1939	13,938	+0.51%
1948	16,638	+1.99%
1960	21,093	+2.00%
1970	28,696	+3.12%
1975	32,450	+2.50%
1980	34,849	+1.44%
1990	42,698	+2.05%
1995	47,721	+2.11%
2000	51,923	+1.83%
2007	57,952	+1.53%
2010	60,596	+1.64%
2015	63,692	+0.95%
2020	66,028	+0.71%
Source: Philippine Statistics Authority

In the 2020 census, the population of Agoo was 66,028 people, with a density of 1,200 inhabitants per square kilometre or 3,100 inhabitants per square mile.

Poverty incidence of Agoo

5 10 15 20 25 30 2006 23.20 2009 21.29 2012 8.50 2015 6.67 2018 3.26 2021 8.67 Source: Philippine Statistics Authority

Just as the national government, the municipal government of Agoo, is divided into three branches: executive, legislative, and judiciary. The judicial branch is administered solely by the Supreme Court of the Philippines. The LGUs have control of the executive and legislative branches.

The executive branch is composed of the mayor and the barangay captain for the barangays.Local Government Code of the Philippines, Book III, Department of the Interior and Local Government official website.

The legislative branch is composed of the Sangguniang Bayan (town assembly), Sangguniang Barangay (barangay council), and the Sangguniang Kabataan for the youth sector.

The seat of Government is vested upon the Mayor and other elected officers who hold office at the Townhall. The Sangguniang Bayan is the center of legislation, stationed in Agoo Municipio.

Members of the Municipal Council
(2022)

Position	Name
Congressman	Dante S. Garcia
Mayor	Frank O. Sibuma
Vice-Mayor	Antonio A. Eslao
Councilors	Jun Alba
	Christian Rivera
	Mark Anthony Refugia
	Ron Boado
	Infinity Sambolledo
	Precy Komiya
	Wina Eriguel
	Florent Bulatao

Agoo has interesting attractions and main festival/events:

• Basilica Minore of Our Lady of Charity
• Museo de Iloko - The 1979 Museo de La Union or Museo Iloko was the former Presidencia of Agoo (restored by the Philippine Tourism Authority in 1981).
• Eagle of the North Park - a giant eagle structure designed by Arch. Anselmo Day-ag as a Symbol of Marcoses' power.
• Agoo Presidencia and New Town Hall
• Agoo Welcome Arch (1578)
• Plaza de la Virgen
• Don Mariano Marcos Memorial State University (Marcos Sports Center) DMMMSU-South La Union Campus
• Imelda Garden (fishermen sculpture, Agoo Town Square and Town Plaza)
• Jose D. Aspiras ancestral house
• Jose D. Aspiras Civic Center
• Our Lady of Lourdes Grotto

• Agoo–Damortis Protected Landscape and Seascape
• Agoo Ecopark (Sta. Rita West/Central)
• Agoo beach (San Nicolas West)
• Camp Wagi (Brgy. Capas)
• San Antonio-San Miguel Eco-Mountain Trail

• Dinengdeng festival and Patronal Town Fiesta (8th, April 26 to May 4, 2012 - "Lifting Agoo to New Heights Through Dynamic, Dedicated and Visionary Leadership." 101 Dinengdeng recipes, an Agoo/Ilocano vegetable delicacy of Ilocanos festivity meant DMMMSU-South La Union Campus Grandstand, Agoo)
• Agoo Kilawin (Ceviche) Festival, December 28, 2011

• San Roque West-San Roque East fish ponds
• Aspiras-Palispis Highway (formerly the Marcos Highway and Agoo-Baguio Road), connecting Agoo to Baguio City

• Juan de Salcedo - Spanish Conquistador whose arrival marked the first presence of the Spanish colonizers in Agoo
• Fray Juan Bautista Lucarelli and Fray Sebastian de Baeza - Franciscan priests who established the Town of Agoo after De Salcedo
• Congressman Jose D. Aspiras - Resident of Agoo, Former Secretary of Tourism (Philippines) official during the Marcos administration.
• Former Congressman and Former Mayor Eufranio Eriguel
• Former Congresswoman and Former Mayor Sandra Eriguel
• Archbishop Antonio L. Mabutas - Native of Agoo who was eventually designated Bishop of the Roman Catholic Archdiocese of Davao from (1972–1996), noted as one of the first Catholic Bishops to officially criticize the Human rights abuses of the Marcos dictatorship.
• Judiel Nieva (also known as Angel de la Vega) - Resident of Agoo who is a transgender actress and businesswoman notable for her claims of seeing a vision of the Virgin Mary atop a guava tree in Agoo, La Union, Philippines in what was labeled as the "Miracle of Agoo" from 1989 until 1993.
• Kyla Romero - Native of Agoo who is a film Director and Screenwriter known for Directing the short film Dosena which became a 2023 FAMAS nominee for Best Short Film, and for writing the screenplay of Dosena and another short film Hinakdal; winner of the Best Screenplay for Short Film for Hinakdal (with Cowriter Alvin Belarmino).
• Jessica Soho - Native of Agoo who is a Filipino broadcast journalist affiliated with GMA Network.
• Mayor Frank Sibuma

• 
  Agoo Public Market
• 
  Town Plaza
• 
  San Roque West fish ponds at Sitio Banaoang
• 
  Agoo beach (San Nicolas East)

• The History and founding of Agoo, La Union (Facebook)
• Free Public Domain Images of Agoo beaches and surrounds (Facebook)
• Philippine Standard Geographic Code
• Philippine Census Information
• Local Governance Performance Management System