Ilagan is a 1st class municipality in the province of Isabela, Philippines. It is the capital municipality and the largest town of Isabela (both land area and total population), located at the junction of the Cagayan and Pinacanauan Rivers. According to the 2000 census, it has a population of 119,990 people in 24,085 households.
The conversion of Ilagan, Isabela on February 2, 1998 (RA 8474) for citihood will make the largest city in the province. But the plebiscite which was held on March 14, 1999 turned down its bid for citihood under the Administration of former Mayor Mercedes P. Uy. The majority of the people voted 'no' in that historic event.
There are 29.313 km of concrete out of 24.56 km. Of national growth that passes through the municipality. Other road networks are 33,005 km provincial roads, 8,909 municipal streets and 269,713 km of barangay roads.
Ilagan is accessible by all means of land transportation. From the Poblacion to the 91 barangays and five adjacent municipalities. The regular jeepneys trips from 6:00 am to 8:00 pm while tricycle trips for 24 hours.
There are terminals of 5 transport companies with air-con buses in the Poblacion while other buses passes by to and from Tuguegarao and Manila.