ISO 3166-2:TH

ISO 3166-2:TH is the entry for Thailand in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1.

Currently for Thailand, ISO 3166-2 codes are defined for 1 metropolitan administration, 1 special administrative city, and 75 provinces. The metropolitan administration Bangkok is the capital of the country and has special status equal to the provinces. The special administrative city Pattaya is a self-governing city in Chonburi Province. Bueng Kan Province, created in 2011, is not listed.

Each code consists of two parts, separated by a hyphen. The first part is TH, the ISO 3166-1 alpha-2 code of Thailand. The second part is two digits, except Pattaya which uses a letter. The digits are currently used in postal code, except for codes 11–19, from which one must subtract 1 to get the postal code from the ISO code. The first digit indicates the geographical region where the subdivision is in:

• 1, 2, 6, 7: Central Thailand
• 3, 4: Northeastern Thailand
• 5: Northern Thailand
• 8, 9: Southern Thailand