Populated places on the Rio Grande de Cagayan

Tuguegarao ( or ), officially the City of Tuguegarao (; ; ; ), is a second-class component city and capital of the province of Cagayan, Philippines. According to the , it has a population of people, making it the most populous city in Cagayan Province, Cagayan Valley and Northeastern Luzon.

Ilagan, officially the City of 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 the second most-populous in Cagayan Valley after Tuguegarao. As of 2025, it also had the highest number of voters in the province, with 105,526 voters.

Aparri (Ibanag: Ili nat Aparri; ; ), officially the Municipality of Aparri, is a municipality in the province of , Philippines. According to the , it has a population of people.

city of the Philippines in the province of Isabela

municipality of the Philippines in the province of Quirino

municipality of the Philippines in the province of Cagayan

Echague, officially the Municipality of Echague, is a municipality in the province of Isabela, Philippines. According to the , it has a population of people.

Cabagan, officially the Municipality of Cabagan (; ; ), is a municipality in the province of Isabela, Philippines. According to the , it has a population of people.

Lal-lo, officially the Municipality of Lal-Lo (; ; ), is a municipality in the province of Cagayan, Philippines. According to the , it has a population of people.

Amulung, officially the Municipality of Amulung, is a municipality in the Province of Cagayan. According to the , it has a population of 50,903 people.

municipality of the Philippines in the province of Isabela

municipality of the Philippines in the province of Isabela

municipality of the Philippines in the province of Cagayan

municipality of the Philippines in the province of Cagayan

Tumauini , officially the Municipality of Tumauini (; ; ), is a municipality in the province of Isabela, Philippines. According to the , it has a population of people.

Gattaran , officially the Municipality of Gattaran (; ; ), is a municipality in the province of Cagayan, Philippines. According to the , it has a population of people.

municipality of the Philippines in the province of Isabela

Gamu , officially the Municipality of Gamu (; ), is a municipality in the province of Isabela, Philippines. According to the , it has a population of people.

Angadanan, officially the Municipality of Angadanan (; ; or Angadanan Nuevo), is a municipality in the province of Isabela, Philippines. According to the , it has a population of people.

municipality of the Philippines in the province of Isabela

municipality of the Philippines in the province of Cagayan

Lasam, officially the Municipality of Lasam (; ; ), is a municipality in the province of Cagayan, Philippines. According to the , it has a population of people.

Camalaniugan, officially the Municipality of Camalaniugan (; ; ), is a municipality in the province of Cagayan, Philippines. According to the , it has a population of people.

municipality of the Philippines in the province of Isabela

Iguig, officially the Municipality of Iguig (; ; ), is a municipality in the province of Cagayan, Philippines. According to the , it has a population of people.

municipality of the Philippines in the province of Isabela

municipality of the Philippines in the province of Isabela

municipality of the Philippines in the province of Isabela