Yen Bai Province Currently, there is only Yen Bai Customs Branch under Hanoi Customs Department. Yen Bai Customs Branch Code of Yen Bai Customs Branch : 01BT Location : Km 05 Yen Ninh street, Dong Tam ward, Yen Bai city, Yen Bai province Phone : (0216) 3893 844 Google Map :Â https://goo.