HISTORY:

                              It was noted that the municipality got it’s name way back during the Spanish American War in the

Philippines. Originally, Sudipen was the barrio of Bangar, La Union. In 1906, a village leader named Bartolome Laoagan Apusen succeeded in organizing it to township of the sub-province of Lepanto, Amburayan. Ten years after in 1916, the township became a municipal district of the province of La Union. Finally on September  14, 1947, Sudipen was reclassified into a regular sixth class   municipality.

                              Originally the township was composed of 10 Barangays or Barrios namely: San Rafael, San Jose, San Francisco, Nagpanawan, Sengngat, Castro, Duplas, Maliclico and Up-uplas.  Barrio Nagpanawan was first subdivided. It was late in 1950’s when Nagpanawan gave birth to Ilocano.

                              Barrio Ipet, came later in late 1960’s from barrio Ilocano. In 1962, barrio  Turod evolved from barrio San Rafael consequently named barrio Poblacion being the seat of the municipality. In 1967, Nagpanawan which was later named Old Central, subdivided and barrio Namaltugan was born. Barrio San Francisco Sur and San Francisco Norte pursuant to Provincial Board Resolution  No. 197 which took effect on Match 12, 1971. Earlier, on the later part of the 1970 barrio Bulalaan was carved out of the barrio Duplas and prior to that, Up-uplas, divided in September 21, 1968 resulting in the evolution  of Porporiket.

               At present, the municipality of Sudipen comprises of seventeen (17) Barangays Five (5) are upland Barangays while Twelve (12) Barangays are in lowlands.