It is a first class municipality in the province of Rizal.
t is the northernmost town in the province and comes after San Mateo, Quezon City coming from Metro Manila. The town is located on the slopes of the Sierra Madre mountain range and features many resorts, It is also one of the largest towns in Rizal province with 172.85 km².
According to the latest census, it has a population of 223,594 inhabitants in 24,524 households.
The legend of Bernardo Carpio is said to have happened in the mountains of Montalban. The legend tells the story of a giant trapped between two mountains.