Area Code 227 – Thai Binh province
The phone area code for Thai Binh province is 227 (international format +84227). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Thai Binh province
Overview of Area Code 227 (Thai Binh, Vietnam)
Area code 227 is the National Destination Code (NDC) assigned to the landline telephone network of Thai Binh province, a coastal administrative region in the Red River Delta of northern Vietnam. This code is used for fixed-line services within the province, covering the provincial capital Thai Binh city and all surrounding districts, including Dong Hung, Hung Ha, Quynh Phu, Thai Thuy, Tien Hai, Vu Thu, and Kien Xuong.
As a geographic code, 227 is tied to the physical location of the subscriber's line. The full national significant number (NSN) for a Thai Binh fixed-line subscriber consists of the area code followed by a 7-digit subscriber number, resulting in a total length of 10 digits when the trunk prefix '0' is included for domestic calls. For example, a typical number might be formatted as 0227 3 456 789 within Vietnam.
Dialing Formats and Instructions
For callers within Vietnam, the trunk prefix 0 must be dialed before the area code. Thus, a domestic call to Thai Binh would be placed as 0227 XXX XXXX. For international callers, the country code for Vietnam (+84) replaces the trunk prefix, and the leading '0' is omitted. Therefore, an international caller would dial +84 227 XXX XXXX.
It is important to note that the area code 227 is not an overlay; it is the sole geographic area code for the province. When dialing locally within Thai Binh, the full area code is still required for all calls, including those between different districts, as per Vietnam's national dialing plan.
Regulatory and Technical Notes
Numbering resources in Vietnam are managed by the Ministry of Information and Communications (MIC) under the National Numbering Plan, which adheres to ITU-T E.164 recommendations. The 227 code is designated for fixed-line services, and numbers under this code are typically provided by incumbent operators such as VNPT (via VNPT Thai Binh) and other licensed fixed-line carriers.
With the increasing adoption of VoIP and IP-based telephony, some fixed-line numbers may be delivered over fiber or cable networks, but the geographic significance of the code remains unchanged for routing and emergency services. Callers should always verify the correct number format, especially when dialing from mobile phones or VoIP services, to ensure proper routing.