Si Thoi, Phayao

Si Thoi, Phayao (ศรีถ้อย, ) is a tambon (subdistrict) of Mae Chai District, in Phayao Province, Thailand. In 2014 it had a population of 7,038 people.

Central administration
The tambon is divided into 13 administrative villages (mubans).

Local administration
The area of the subdistrict is shared by two local governments.
 * the subdistrict municipality (thesaban tambon) Mae Chai (เทศบาลตำบลแม่ใจ)
 * the subdistrict municipality (thesaban tambon) Si Thoi (เทศบาลตำบลศรีถ้อย)