Thailand divides its settlements (thesaban) into three categories by size: city municipalities (thesaban nakhon), towns (thesaban mueang) and townships (or subdistrict municipality) (thesaban tambon).^[1] There are 32 city municipalities as of January 2015.

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BMR

Nakhon Ratchasima

Chiang Mai

Lampang

Hat Yai

Udon Thani

Khon Kaen

Ubon Ratchathani

Nakhon Si Thammarat

Nakhon Sawan

Nakhon Pathom

Phitsanulok

Pattaya

Songkhla

Surat Thani

Yala

Chiang Rai

Trang

Sakon Nakhon

Phuket

Mae Sot

Ko Samui

Rayong

Phra Nakhon Si Ayutthaya

Chonburi province

Samut Sakhon province

City municipalities (Nakhon) in Thailand

City municipalities in Bangkok Metropolitan Region – BMR: Bangkok, Nonthaburi, Pak Kret, Samut Prakan, and Rangsit
City municipalities in Chonburi province: Chaophraya Surasak and Laem Chabang
City municipalities in Samut Sakhon province: Samut Sakhon and Om Noi

The national capital Bangkok and the special governed city Pattaya fall outside these divisions. They are "self-governing districts".

Due to the outdated nature of the thesaban system, any city municipality's growth subsequent to its settlement designation is not included in both area and population numbers. For this reason, the Department of Public Works and Town & Country Planning,^[2] and each province's Provincial Administrative Organization regularly revise and publish up-to-date city boundaries (Thai: เขตเมือง) to reflect population growth. These revisions are royally decreed and published in the Royal Thai Government Gazette. The term เขตเมือง/khet mueang can also be translated to the term urban area, a widely used term to describe and designate large cities.

Most Thai cities' revised boundaries are contained in the province's capital district, known as Amphoe Mueang. Chiang Mai is the only city outside Bangkok to cover multiple districts in its urban area.

Thailand has an urbanization rate of 52% (2021), translating to 36,217,020 people of the total population.^[3][4] This rate is based on the thesaban system, meaning that 8,442,107 people live in city municipalities, 4,437,112 people live in town municipalities and 23,337,801 people live in townships (subdistrict municipalities). According to the khet mueang system, 21,838,418 people (31.35% of total population) live in urban areas with a population greater than 150,000.

Several agencies issue population figures. Locally registered Thai populations are compiled by the Department of Local Administration (DLA). These figures are labeled as "Locally Registered Thai Population" and reflect the migrant, upcountry, and seasonal nature of Thai labor flows to the capital and tourist hot spots, yet maintain upcountry registration. Figures are very different from those by the National Statistics Office (NSO), which conducts the decennial census by attempting to count the total resident Thai population plus under 1,000 permanent resident foreigners. The result by the NSO is labeled as "Total Thai Population". Neither of the two offices release municipal level figures that include non-permanent residents, long-stay expatriates and figures for contracted foreign ASEAN migrants (a significant labor segment in cities like Bangkok, Pattaya, Chiang Mai, and Phuket, totaling two to three million workers), though this inclusion is being increasingly regularized since 2014. The NSO did release projected figures including regularized ASEAN migrants, i.e., "total resident population" down to the provincial level for 2017.^[5]

The table below lists Department of Local Administration (DLA) (local registered Thai) 2020 figures. For the NSO compiled total Thai resident decennial census municipal counts view here..

In most cases, municipal population numbers do not represent the current size of each individual city, but only the administrative core. Geographically limited city municipalities such as Koh Samui and the suburban city municipalities of Bangkok, namely Nonthaburi, Pak Kret, Samut Prakan, Nakhon Pathom, and Samut Sakhon, are the exception. Bangkok's suburban areas are inside the Bangkok Metropolitan Region and therefore do not have their own urban or metropolitan area.

• Bangkok
• Pak Kret, Nonthaburi, Thailand
• Pattaya
• Si Racha District and Chaophraya Surasak, Chon Buri province, Eastern Thailand
• Khon Kaen
• Chiang Mai, the largest urban area in the north and second-largest urban area in the country
• Hat Yai, part of the largest urban area (conurbation) in the south (Greater Hat Yai-Songkhla)
• Samut Prakarn, background is Bangkok
• Nakhon Pathom, Phra Pathommachedi in Nakhon Pathom City
• Phitsanulok
• Hua Hin

The following table lists the ten largest cities in Thailand by urban population, based on Department of Local Administration (DLA) figures. These figures represent the current size of each city, accounting for areal and population growth subsequent to each city's original city municipality designation.

Bangkok and Chiang Mai are the only cities covering multiple districts (known as Khet for Bangkok and Amphoe for the provinces), and the only two cities with a population of over one million. Although Pattaya is a "self-governing district" (located inside, but not part of Bang Lamung district), it has grown into all neighboring sub-districts and accounts for the largest population percentage, making it de facto a part of the "Pattaya-Bang Lamung-Jomtien" area. Chiang Mai is the only provincial city whose city boundaries (Thai: เขตเมือง) cover districts adjacent to the Amphoe Mueang district (Capital district).^[7]

Department of Local Administration (DLA) figures. The towns in bold characters are capitals.

There were 2,266 township municipalities as of 20 December 2017.^[10]