Charoen Rat  Charoen Rat (, ) is a village and subdistrict ("tambon") in Mae Chai District, in Phayao Province, Thailand. As of 2005, it has a population of 4,141 people. It is in the northwestern part of the province not far from the border with Chiang Rai Province. It lies along the National Road 1 (Phahon Yothin Road) and is connected by road to Pa Faek in the north and Mae Chai and Phayao in the south. The "tambon" has eight villages under its jurisdiction.