Here you go.
Vietnam's postcodes have 6 digits.
The 1st 2 digits represent the province or city, the middle 2
digits represent the district or town, the 5th digit represents the
commune/precinct and finally the 6th digit represents the address
code.
Just to note that I have not seen any Vietnam addresses with
postcodes so far.
An Giang Province 88xxxx
Bac Giang Province 23xxxx
Bac Kan Province 26xxxx
Bac Lieu Province 96xxxx
Bac Ninh Province 22xxxx
Ba Ria-Vung Tau Province 79xxxx
Ben Tre Province 93xxxx
Binh Dinh Province 59xxxx
Binh Duong Province 82xxxx
Binh Phuoc Province 83xxxx
Binh Thuan Province 80xxxx
Ca Mau Province 97xxxx
Can Tho City 90xxxx
Cao Bang Province 27xxxx
Da Nang 55xxxx
Dak Lak Province 63xxxx
Dak Nong Province 64xxxx
Dien Bien Province 38xxxx
Dong Nai Province 81xxxx
Dong Thap Province 87xxxx
Gia Lai Province 60xxxx
Ha Giang Province 31xxxx
Ha Nam Province 40xxxx
Ha Tinh Province 48xxxx
Hai Duong Province 17xxxx
Hai Phong 18xxxx
Hanoi 10xxxx - 15xxxx
Hau Giang Province 91xxxx
Hoa Binh Province 35xxxx
Ho Chi Minh City 70xxxx - 76xxxx
Hung Yen Province 16xxxx
Khanh Hoa Province 65xxxx
Kien Giang Province 92xxxx
Kon Tum Province 58xxxx
Lai Chau Province 39xxxx
Lam Dong Province 67xxxx
Lang Son Province 24xxxx
Lao Cai Province 33xxxx
Long An Province 85xxxx
Nam Dinh Province 42xxxx
Nghe An Province 46xxxx - 47xxxx
Ninh Bình Province 43xxxx
Ninh Thuan Province 66xxxx
Phu Tho Province 29xxxx
Phu Yen Province 62xxxx
Quang Binh Province 51xxxx
Quang Nam Province 56xxxx
Quang Ngai Province 57xxxx
Quang Ninh Province 20xxxx
Quang Tri Province 52xxxx
Soc Trang Province 95xxxx
Son La Province 36xxxx
Tay Ninh Province 84xxxx
Thai Binh Province 41xxxx
Thai Nguyen Province 25xxxx
Thanh Hoa Province 44xxxx - 45xxxx
Thua Thien-Hue Province 53xxxx
Tien Giang Province 86xxxx
Tra Vinh Province 94xxxx
Tuyen Quang Province 30xxxx
Vinh Long Province 89xxxx
Vinh Phuc Province 28xxxx
Yen Bai Province 32xxxx