It is bounded on the north by the municipality of Balbalan, on the south by the municipality of Tinglayan, on the east by Tabuk city, and on the west by the province of Abra and south-western part of the municipality of Sadanga, Mountain Province.

In the 2020 census, the population of Pasil, Kalinga, was 10,577 people,[3] with a density of 56 inhabitants per square kilometre or 150 inhabitants per square mile.

Poverty incidence of Pasil Source: Philippine Statistics Authority[11][12][13][14][15][16][17][18] Pasil, belonging to the lone congressional district of the province of Kalinga, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code.

In an earlier time, Kabunian–the supreme deity of the Kalinga–left a drop of water upon an ancient tree he passed on one of his travels.

This drop trickled down and with a great force akin to magnetism, attracted nearby brooks and rivulets to form what is now called the Pasil River.