Udon Thani is a city in Isan (Northeast Thailand), the capital of Udon Thani Province and the sixth largest city in Thailand. The city municipality (thesaban nakhon / city proper) had a population of 130,531 people as of 2019, while Udon Thani's urban area, Mueang Udon Thani, has a population of approximately 400,000. Udon Thani is one of four major cities in Isan, the others being Nakhon Ratchasima, Ubon Ratchathani, and Khon Kaen. Together they are known as the "big four of Isan".
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