Area Code 39 – Chanthaburi/Trat

Overview of Area Code 39 (Thailand)

Area code 39 is a geographic National Destination Code (NDC) within the Thai numbering plan, assigned to the eastern provinces of Chanthaburi and Trat. These provinces border Cambodia and are known for their gem trade, tropical fruit orchards, and coastal tourism. The code serves both fixed-line PSTN and VoIP-based local services within this administrative region.

Geographic Coverage and Administrative Jurisdiction

The 39 area code covers the entire province of Chanthaburi (including the provincial capital, Mueang Chanthaburi) and the province of Trat (including Mueang Trat). It also encompasses the districts of Laem Sing, Khlung, Pong Nam Ron, Makham, and Bo Rai in Chanthaburi, as well as Ko Chang, Khao Saming, and Bo Rai in Trat. The code is administered by the National Broadcasting and Telecommunications Commission (NBTC) of Thailand, which oversees the national numbering plan under ITU-T E.164 recommendations.

Dialing Formats

• Local dialing (within the 39 area): When calling a fixed-line number within the same area code, subscribers typically dial only the 6- or 7-digit local subscriber number (without the trunk prefix '0' or the area code). For example, a local call to a number in Chanthaburi might be dialed as 123456.
• Domestic long-distance (from other Thai provinces): Callers outside the 39 area must dial the trunk prefix 0 followed by the area code 39 and the subscriber number. For instance, to call a fixed line in Chanthaburi from Bangkok, dial 0 39 123456 (the total number of digits after the trunk prefix is 8, including the area code).
• International format (from abroad): Callers from outside Thailand should dial the international access prefix (e.g., 00 or +), followed by the Thailand country code 66, then the area code 39 (without the leading '0'), and the subscriber number. For example, to call a number in Trat from the United States, dial +66 39 123456.

Numbering Structure and Overlays

Fixed-line numbers under area code 39 are typically 7 digits long (excluding the trunk prefix). The NBTC has not implemented any overlay codes in this region, so the 39 code remains the sole geographic code for these provinces. However, as with all Thai fixed-line numbers, subscribers may have the option to use VoIP services that present a 39 number, but the geographic significance remains tied to the physical location of the line.

Caller Instructions

For local callers: If you are physically located within the 39 area and calling another fixed line in the same area, you may omit the trunk prefix and area code. However, if you are calling a mobile phone, you must include the mobile prefix (e.g., 08x) and the full number, as mobile numbers are non-geographic.

For foreign callers: Always use the international format (+66 39 ...) and ensure you drop the leading '0' from the area code. Be aware that some Thai numbers may be presented with the leading '0' in local directories; remove it when dialing internationally.

For assistance with routing or to verify the correct number length, consult your telecom provider or the NBTC guidelines.