Si Thoi, Phayao

Si Thoi, Phayao (, ) is a "tambon" (subdistrict) of Mae Chai District, in Phayao Province, Thailand. In 2014 it had a population of 7,038 people.
Administration.
Central administration.
The "tambon" is divided into 13 administrative villages ("mubans").
Local administration.
The area of the subdistrict is shared by two local governments.