San Isidro was a premier barangay or barrio before the outbreak of the Second World War encompassing Malilion ,Bensican and Salpad with a total land area of 543 hectares.

            However , with the creation of PACD in the 60’s other barangays were organized to accelerate the impending development in the countryside . Reduced to merely 85-90 hectares in area, San Isidro has only 3 sitios now, Nagcoralan , Sta. Crusan and San Juan  with a population of 728 based in the latest census .

            As its name signifies, this barangay is named after San Isidro ,the patron saint of farmers and agriculture . Up to this time the belief in the powers of intercessory prayers of their patron saint working wonders for the welfare of the people is very much alive.

            The development of the barangay takes us back to the pioneers from Ilocos in 1920 who came to settle in this barangay the Laureta , Serquiña , Martinez and Lucas clans .