Telephone Numbers in Thailand - Geographic Area Codes

Geographic Area Codes

Geographic (fixed line) area codes are, excluding the STD prefix 0, one digit in Bangkok and nearby provinces (area code 2) and two digits in provincial (area codes 3x, 4x, 5x, and 7x). In Thailand, an area code is usually shared by multiple provinces and roughly follows province borders.

Fixed line subscriber numbers are six digits in Thailand (except Bangkok, Nonthaburi, Pathum Thani and Samut Prakan, i.e. area code 2). Prior to 1980, subscriber numbers were six digits in Bangkok, Nonthaburi, Pathum Thani and Samut Prakan. From 1980, subscriber numbers in these areas were expanded to seven digits in phases to meet new demands. The first digit of a subscriber number is associated with a specific area in the area code. In Bangkok, Nonthaburi, Pathum Thani and Samut Prakan, the second digit of a subscriber number identifies the service provider, which is almost always Telephone Organization of Thailand (TOT), as TOT holds a near-monopoly of the Thai fixed line market.

Thus, a full national number is 9 digits, including the STD prefix 0. When writing a telephone number with the area code, the area code and subscriber number is separated with a hyphen, also in the middle of subscriber number. Examples:

• A number 2134567 in Bangkok: 02-2134567
• A number 213456 in Khon Kaen: 043-213456

Thailand switched to closed dialing plan in 2001, which means calling within the area code requires the area code to be dialed. e.g. When calling a number 2134567 in Bangkok (02) from a fixed line phone:

• Within Bangkok, Nonthaburi, Pathum Thani and Samut Prakan: 02-2134567
• Outside Bangkok, Nonthaburi, Pathum Thani and Samut Prakan: 02-2134567
• Outside Thailand: +66-2-2134567 (the initial 0 of the area code is omitted)

02 Bangkok (Krung Thep Maha Nakhon), Nonthaburi, Pathum Thani, Samut Prakan & Phutthamonthon (Nakhon Pathom) 032 Phetchaburi, Prachuap Khiri Khan & Ratchaburi 034 Kanchanaburi, Nakhon Pathom (except Phutthamonthon), Samut Sakhon & Samut Songkhram 035 Ang Thong, Phra Nakhon Si Ayutthaya & Suphan Buri 036 Lop Buri, Saraburi & Sing Buri 037 Nakhon Nayok, Prachin Buri & Sa Kaeo 038 Chachoengsao, Chon Buri & Rayong 039 Chanthaburi & Trat 042 Bueng Kan, Loei, Mukdahan, Nakhon Phanom, Nong Bua Lamphu, Nong Khai, Sakon Nakhon & Udon Thani 043 Kalasin, Khon Kaen, Maha Sarakham, Roi Et & Nam Nao (Phetchabun) 044 Buri Ram, Chaiyaphum, Nakhon Ratchasima & Surin 045 Amnat Charoen, Si Sa Ket, Ubon Ratchathani & Yasothon 053 Chiang Mai, Chiang Rai, Lamphun & Mae Hong Son 054 Lampang, Nan, Phayao & Phrae 055 Kamphaeng Phet, Phitsanulok, Sukhothai, Tak, Uttaradit, Sam Ngam & Wachirabarami (Phichit) 056 Chai Nat, Nakhon Sawan, Phetchabun (except Nam Nao), Phichit (except Sam Ngam & Wachirabarami) & Uthai Thani 073 Narathiwat, Pattani & Yala 074 Phatthalung, Satun & Songkhla 075 Krabi, Nakhon Si Thammarat & Trang 076 Phang Nga & Phuket 077 Chumphon, Ranong & Surat Thani