Area Code 56 – Chai Nat/Nakhon Sawan/Phetchabun/Phichit/Uthai Thani

Overview of Thailand Area Code 56

Thailand's country calling code is +66, and area code 56 is a geographic National Destination Code (NDC) assigned to a cluster of provinces in the upper central and lower northern regions of the country. Specifically, this code serves the provinces of Chai Nat, Nakhon Sawan, Phetchabun, Phichit, and Uthai Thani. These areas are part of Thailand's fixed-line PSTN network, operated primarily by the state-owned Telecom Service Provider (TOT) and other licensed operators. The code is used for traditional landline services, including residential, business, and government lines, and is not associated with mobile services, which have their own non-geographic prefixes.

Geographic Coverage and Administrative Jurisdiction

The area code 56 covers a contiguous region that lies north of Bangkok, straddling the Chao Phraya River basin and extending into the Phetchabun Mountains. Key cities and districts within this code include:

• Nakhon Sawan – a major transportation hub and the largest city in the region, often called the 'Gateway to the North'.
• Chai Nat – known for the Chao Phraya Dam and agricultural production.
• Uthai Thani – a riverside province with historical significance.
• Phichit – located in the Nan River valley, famous for its crocodile farms and lotus ponds.
• Phetchabun – a mountainous province to the east, popular for its cool climate and national parks.

Administratively, each province has its own governor and provincial administration, but they share the same trunk dialing code for fixed-line services. This grouping is based on historical telecommunication routing and numbering plan optimization, not on a single metropolitan area.

Dialing Formats and Caller Instructions

For callers within Thailand, dialing a fixed-line number in this region requires the trunk prefix '0' followed by the area code '56' and then the subscriber number, which is typically 6 to 7 digits long. The complete national format is: 0 56 XX XXX XX (or 0 56 XXX XXXX, depending on the number length). For example, a local number in Nakhon Sawan might be 0 56 123 456.

For international callers, the country code +66 is used, and the leading '0' of the national prefix is dropped. Thus, the international format becomes: +66 56 XX XXX XX. For instance, if the national number is 0 56 123 456, the international dialing format is +66 56 123 456.

When calling from outside Thailand, you must first dial your country's international access code (e.g., 011 from the US, 00 from most European countries), followed by 66, then the area code without the leading zero, and finally the subscriber number. If you are within Thailand but outside the 56 area, you simply dial 0 56 followed by the number. There are no overlay codes or 10-digit dialing requirements in this region; the standard national dialing plan applies.

Important Considerations for Callers

Fixed-line numbers in Thailand are not portable across geographic areas; they are tied to the physical location of the line. If you are calling a business or residence in this region, ensure you have the correct area code. For mobile calls, remember that Thai mobile numbers start with 08X or 09X and are not affected by area codes. Also, be aware that some businesses may use VoIP services that present a 56 number, but the routing is still based on the geographic numbering plan.

For emergency services, always dial 191 (police), 199 (fire), or 1669 (medical emergency) from any phone in Thailand, regardless of location.