 In the reign of King Chulalongkorn (Rama V) during the construction of the northeastern railway through the area, the Nok Yung and Noi mountains were blasted through to make a cut ("chong" in Thai) for the railway.The people named the village Pak Chong, meaning "mouth of the channel".Pak Chong is the biggest district of Nakhon Ratchasima by area.