Lungao was formerly as sitio of Barrio San Antonio along with Salingcob and Dalumpinas. Due to the increased population and the PACD creation of barangays in the 60’s it was converted as a separate barangay. Lungao is bounded on the north by Brgy. Dalumpinas, in the south by Ambayaoan River , on the East Brgy. Salingcob , and on the west by Brgy. Camanggana . it has approximate land area of 900 hectares.

            It remained a mystery on how the barangay acquired the name Lungao . No historical data could be found  even the elders in the barangay has no story to tell on how it derived its name .

            Before the 70’s Lungao was already a progressive and a thickly populated community .It shared the same San Antonio Elementray with Salingcob. The San Antonio barangay High School in the same campus was the first public school established in the municipality and founded by the late Mr. Edilberto Tamondong Lungao became a virtual model farm , demo farm and experimental farm rolled into one due to the  pioneering agricultural ventures of Mr. Edilberto Tamondong , Don Gaudencio Marciano and Andres Lopez . They made Lungao a top vegetable producer and made San Nicolas rose from rural obscurity to regional prominence by being dubbed as the “ vegetable basket of Eastern Pangasinan.

            In 1976 , super typhoon ‘Didang “devastated San Nicolas by giving the biggest flood  ever recorded in the history of our town. The Ambayaoan River overflowed and totally washed out the residential area of San Antonio . the entire school campus was totally washed away so were the dwelling of Lungao and Salingcob and the people were forced to evacuated . the community was in total disarray . Some residents fled to higher grounds for safety in Brgy. Salingcob “Little baguio . others who could not simply leave their farms had stayed being in the place now called “Nagpanawan”presently a sitio of Salingcob .While most of Lungao resident simply settled inward away from the Ambayaoan River.Brgy.Capt. Pedro Sulio was instrumental in the construction of a new roadline from the provincial Road going to the barangay as all of the barangay road were washed out by the flood. This road is now usually called Lunngao Road which interconnects the barangay to the town proper and a major route to barangays  Salingcob and Dalumpinas.

            Lungao has now recovered from the 1976 flood and greatly improved and progressed as a barangay . Yet  , is now only a few meters away from the unprotected riverbank that every rainy season brings back the memories of the great 1967 flood to the people.

With steady supply of water from Ambayaoan , and blessed with rich fertile soil and sturdy industrious people. Lungao nis still a booming agricultural community . Farming is the primary source of income with palay , corn, and vegetable as the main farm product . Livestock raising and overseas employment as secondary source of income.

Some local leaders raised to prominence and became leaders of the town as councilors like the late Don Gaudencio Marciano and Don Camilo brgy. Capt. Conrado Martinez , who became the ABC President and ex-officio member of the  Sangguniang Bayan. Prominent families in the barangay are the Fabionar , Caser,Camiloza, Sulio , Martinez and Arquero among others.