Pamplona, officially the Municipality of Pamplona, is a municipality in the province of Negros Oriental, Philippines. According to the 2020 cens…Pamplona, officially the Municipality of Pamplona, is a municipality in the province of Negros Oriental, Philippines. According to the 2020 census, it has a population of 39,805 people. Originally the place was called “Tampa”, named after a big shady tree located at the heart of the town.