Mường Lay, Điện Biên

Mường Lay is a ward of Điện Biên Province, northwestern Vietnam.
The Standing Committee of the National Assembly promulgated Resolution No. 1661/NQ-UBTVQH15 on the rearrangement of commune-level administrative units of Điện Biên Province in 2025. Accordingly, Mường Lay Ward was established under Điện Biên Province on the basis of the entire 22.88 km² of natural area and a population of 5,139 from Na Lay Ward; the entire 29.33 km² of natural area and a population of 960 from Sông Đà Ward; the entire 60.46 km² of natural area and a population of 5,535 from Lay Nưa Commune of Mường Lay Town; and the entire 110.00 km² of natural area and a population of 6,574 from Sá Tổng Commune of Mường Chà District.