Authority of the organization could not be found as old records were allegedly destroyed by termites. Base on previous reports, it is revealed that this Command was organized at the Capitol Building, Vigan, Ilocos Sur sometime in the year 1901. Then it was transferred to Barangay Tamag, Vigan, Ilocos Sur where it was named Camp President Elpidio R Quirino. In the year 1972, the municipality of Bantay under the Administration of Mayor Amado Mendoza, donated six (6) hectares of land to the AFP situated in Bulag, Bantay, Ilocos Sur, this facilitated the construction of a new administrative building for the Ilocos Sur Constabulary Command, now renamed Ilocos Sur PNP Command. The Command was transferred to its present site on 30 October 1974.

This Headquarters was constructed on 5 April 1974 during the tour of duty of Major Benjamin Aguinaldo, the incumbent Provincial Commander. The lot presently occupied has a land area of six (6) hectares and it was donated by the municipality of Bantay, Ilocos Sur during the administration of Mayor Amado Mendoza, sometime in 1973.

At present this Office was manned by fifty-eight (58) PCOs and eight hundred twenty-six (826) PNCOs under the leadership of Police Senior Superintendent VIRGILIO GAGARIN FABROS (DSC) as Provincial Director. Ilocos Sur Police Provincial Office since September 10, 2007. It has two (2) Provincial Mobile Group, two (2) City Police Stations and thirty two (32) Municipal Police Stations out of this thirteen (13) are located in upland Municipalities.