Area Code 3 – Trongsa
The phone area code for Trongsa is 3 (international format +9753). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Trongsa
Geographic Coverage and Administration
The area code 3 is the National Destination Code (NDC) assigned to the Trongsa district in central Bhutan. Trongsa is a historically significant administrative region, serving as the seat of the Trongsa Dzongkhag and the ancestral home of the Bhutanese monarchy. The code covers the town of Trongsa and its surrounding gewogs (village blocks), including areas along the main east-west highway. As a geographic code, it is used exclusively for fixed-line (PSTN) services within this jurisdiction.
Dialing Formats
To call a fixed-line number in Trongsa from abroad, dial the international access prefix (e.g., 00 or +), followed by Bhutan's country code 975, then the area code 3 (without the leading trunk prefix), and the subscriber's 6-digit local number. For example, a local number such as 351234 would be dialed as +975 3 51234 from outside Bhutan. Within Bhutan, callers must use the trunk prefix 0 before the area code: 0 3 51234. When dialing from a mobile phone within Bhutan, the same trunk prefix applies. The total length of a national significant number (NSN) for fixed lines in Bhutan is 8 digits, including the area code but excluding the trunk prefix.
Caller Instructions
For international callers, always replace the trunk prefix '0' with the country code '975' and the '+' sign when using a mobile phone. For example, to call a Trongsa number from the United States, you would dial 011 975 3 51234. From the United Kingdom, dial 00 975 3 51234. Local callers within Trongsa can dial the 6-digit subscriber number directly without the area code, but this is only possible within the same exchange area. For calls from other districts in Bhutan, the trunk prefix and area code are mandatory.
Overlay and Numbering Considerations
Bhutan's numbering plan is administered by the Bhutan InfoComm and Media Authority (BICMA). Currently, there is no overlay code for Trongsa; the area code 3 is unique to this region. However, as the country's telecommunications infrastructure evolves, number portability may allow subscribers to retain their numbers when moving between operators, but the geographic significance of the code remains for fixed-line services. VoIP services may also be assigned numbers from this range, but they are not location-dependent.