The name "Dilasag" is divided into two syllables. The prefix
Di in the native language means "abundance", added to the word
lasag which means "meat". The coined word "Dilasag", however, does not only mean abundance of meat in the place, but also refers to the over sufficient supply of forest products, marine products and minerals. In early 1924, a group of
Ilocano settlers with a number of
Kapampangans and
Pangasinenses from
Tarlac arrived in
Casiguran, which was then part of
Nueva Vizcaya. Finding the natives unfriendly to them, the settlers moved along the coastline going north and settled finally to what is now called Dilasag. The place was considered habitable, because the native Dumagats, particularly
Casiguran Agta, in the place were friendly. Later, more families came, establishing a community. This community was soon recognized by the mayor of Casiguran, by then a municipality of
Quezon. It was declared a
sitio of barangay Culat and eventually a
barrio of Casiguran in consideration of its rapid progress and development. In 1959, Quezon
1st District Representative
Manuel Enverga introduced
House Bill No. 2863 in the
House of Representatives, which was later enacted into law with the passage of Republic Act No. 2452 on June 21, 1959, making Dilasag a municipal district and separating it from Casiguran. It was converted into a municipality on June 18, 1966. It was then part of the province of Quezon under its sub-province of
Aurora until the latter became a province of its own in 1979. ==Geography==