During the last term of the late assemblyman Francisco Perfecto, Panganiban became Payo again on April 20, 1957, under Republic Act No.

[5] Congressman Jose M. Alberto (through Republic Act 2122 enacted without executive approval April 15, 1959[6]) changed the name to Panganiban again by which it is officially known at present.

According to legend, the town's early settlers elected a tribal chief whom they called “Payo” which could have been their vernacular term for headman.

The boundary in Panganiban Bay is a straight line from Amontol Point to the mouth of the Pangcayanan Creek.

The boundary in the mainland of said municipalities extends from the mouth of Pangcayanan Creek following the natural course of said creek up to the concrete culvert and from that point of straight line to sitio Inacban: Provided, That sitio Inacban belongs to the municipality of Panganiban.Panganiban is politically subdivided into 23 barangays.