An amphoe (sometimes also amphur, Thai: อำเภอ, [ʔāmpʰɤ̄ː]) is the second level administrative subdivision of Thailand. Usually translated as district, amphoe make up the provinces, and are analogous to a county. Amphoe are further subdivided into tambon.
Altogether Thailand has 878 districts, not including the 50 districts of Bangkok which are called khet (เขต) since the Bangkok administration reform in 1972. The number of amphoe in a province differs, from only 3 in the smallest provinces up to the 50 urban districts of Bangkok. Also the sizes and population of the amphoe differs greatly, the lowest population being in Ko Kut (Trat Province) with just 2,042 citizens, while Mueang Samut Prakan (Samut Prakan Province) has 509,262 citizens. The khet of Bangkok have the smallest areas – Khet Samphanthawong is the smallest with only 1.4 km² – while the amphoe of the sparsely populated mountain regions are bigger than some provinces – Umphang (Tak Province) with 4,325.4 km² is the largest and also has the lowest population density.
The names of the Amphoe are usually unique, but in a few cases different Thai names have the same form in English due to the flaws of the romanization system. The notable exception, however, is the name Amphoe Chaloem Phra Kiat, which was given to five districts created in 1996 in celebration of the 50th anniversary of King Bhumibol Adulyadej's accession to the throne. Chaloem Phra Kiat (เฉลิมพระเกียรติ) means in commemoration of or in honour of a royal family member.
Each district is led by a District Chief Officer (Nai Amphoe, นายอำเภอ), who is appointed by the Ministry of the Interior. The officer is a subordinate of the provincial governor.
Amphoe Mueang 
The district which contains the administration office of the province is the Amphoe Mueang (lit. town district). The district should not to be confused with the capital town itself, which is a different administrative entity usually much smaller than the district. Until the 1930s most of the capital districts had names just like other districts, whereas districts dating back to old provinces had the word Mueang in their name. In 1938 all the capital districts were renamed to Amphoe Mueang, whereas in all non-capital districts the Mueang was removed from the name. The notable exception to this rule is Ayutthaya, where the capital district is named Amphoe Phra Nakhon Si Ayutthaya (instead of Amphoe Mueang Ayutthaya) – the same as the province, which is fully named Phra Nakhon Si Ayutthaya. Also the capital districts of Thonburi and Phra Nakhon provinces had the same name as the province, which they kept when the two provinces were merged to form Bangkok metropolis.
In most cases the capital district is also the most populous district of the province, as the provincial administration is usually located at the largest town of the province. Songkhla Province is the most striking exception, as the town (and thus also the district) Hat Yai grew much faster than the capital Mueang Songkhla due to its better transport connection.
There are four districts in Thailand (Chan, Pan, Suang, Yang) which contain the term Mueang in their name as well, even though they are not capital districts. All of these were created relatively recently between 1973 and 1995.
King Amphoe 
Minor districts (King Amphoe, กิ่งอำเภอ — "กิ่ง" literally branch) are set up when the administration of areas remote to the district center gets too uncomfortable for the citizen. Most of the tasks of the Amphoe are transferred to the King Amphoe, but it is still partially a subordinate of the Amphoe it was created from. Once the King Amphoe meets the necessary qualifications to become an Amphoe, it is usually promoted. However, not every newly created Amphoe has to begin as a King Amphoe: if the qualifications are met directly, this phase is skipped. While usually a minor district is upgraded after a few years, in some cases it remained as a minor district for decades. For example Ko Yao was a minor district for 85 years until it was upgraded in 1988. Sometimes a district was downgraded to a minor district as well, like Thung Wa which lost a lot of its population to neighboring La-ngu minor district, so finally La-ngu was upgraded and Thung Wa downgraded. Another example is Chumphon Buri, which was reduced after the more developed part was split off to form a new district and the remaining district was downgraded.
The qualification necessary is a population of at least 30,000 people and at least 5 tambon, or if the area is more than 25 km away from the district office a population of at least 15,000 and 4 tambon.
A minor district is led by a chief officer (Hua Na King Amphoe, หัวหน้ากิ่งอำเภอ).
The Thai word King (กิ่ง) means branch and should not be confused with the English word King. The officially recommended translation is minor district – however they are also quite commonly translated as subdistrict, which is the recommended translation for tambon, and also wrongly suggests that they are at a lower administrative level than the Amphoe.
The Thai government decided to upgrade all remaining 81 minor districts to full districts on May 15, 2007 in order to facilitate their administration. With the publishing in the Royal Gazette on August 24 the upgrade became official.
District office 
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The administration of the district is housed in an office building called Thi wa kan Amphoe (ที่ว่าการอำเภอ), which also marks the center of each district. Distances on road signs are always calculated to this office building. The office is usually located in the largest settlement of the district, to make it easily reachable for the majority of the population – one of the tasks of the Amphoe is the civil registry, which makes the district the most important of the administrative levels for the general Thai people.
List of Amphoe 
|1.||Mueang Samut Prakan||435,122||Umphang||4325.4||Pom Prap Sattru Phai||45,187.9|
|2.||Mueang Nakhon Ratchasima||430,053||Thong Pha Phum||3655.2||Samphanthawong||30,182.1|
|3.||Mueang Udon Thani||379,851||Ban Rai||3621.5||Thon Buri||24,494.5|
|4.||Mueang Khon Kaen||359,065||Mae Chaem||3361.2||Din Daeng||22,180.8|
|5.||Mueang Nonthaburi||332,388||Sangkhla Buri||3349.4||Khlong San||20,844.6|
|922.||Chaloem Phra Kiat||7,517||Khlong San||6.1||Nong Ya Plong||10.0|
|923.||Don Phut||6,957||Phra Nakhon||5.5||Kaeng Krachan||9.8|
|924.||Ko Sichang||4,417||Bang Rak||5.5||Sangkhla Buri||8.7|
|925.||Ko Chang||4,399||Pom Prap Sattru Phai||1.9||Si Sawat||6.1|
See also 
- "พระราชกฤษฎีกาเปลี่ยนนามจังหวัด และอำเภอบางแห่ง พุทธศักราช ๒๔๘๑". Royal Gazette (in Thai) 55 (ก): 658–666. 1938-11-14.
- Thai-English Transcription of Changwat, Amphoe, King Amphoe and Tambon. Bangkok: Kō̜ng Wichākān læ Phǣnngān, Krom Kānpokkhrō̜ng. 2007. ISBN 978-974-7857-04-7.
- "แถลงผลการประชุม ครม. ประจำวันที่ 15 พ.ค. 2550" (in Thai). Manager Online.
- "พระราชกฤษฎีกาตั้งอำเภอฆ้องชัย...และอำเภอเหล่าเสือโก้ก พ.ศ. ๒๕๕๐" (PDF). Royal Gazette (in Thai) 124 (46 ก): 14–21. August 24, 2007.
- "Population and Housing Census 2000". National Statistical Office. 2000. Retrieved 2009-01-17.