BANGKOK — 25 March 2026, Thailand’s population stood at 65,809,011 as of 31 December 2025, according to the Central Registration Office under the Department of Provincial Administration.
The figures show 64,820,708 Thai nationals and 988,620 non-Thai residents recorded in the civil registration system.
Data compiled from the announcement ranks the 10 most populous provinces as follows:
- Bangkok — 5,422,568
- Nakhon Ratchasima — 2,613,132
- Ubon Ratchathani — 1,865,501
- Chiang Mai — 1,798,588
- Khon Kaen — 1,785,462
- Chonburi — 1,618,485
- Buriram — 1,570,279
- Nakhon Si Thammarat — 1,540,132
- Udon Thani — 1,556,337
- Si Sa Ket — 1,452,941
Bangkok remains by far the most populous area, with more than double the population of second-ranked Nakhon Ratchasima. Most of the top 10 provinces are located in the northeastern region.
The total marks a decrease from 65,951,210 recorded in 2024, a drop of about 142,199 people.
