There are like a thousand top 10/20/whatever lists of city size in Thailand, and I've never seen two lists that are the same. Most vary wildly, depending on a whole bunch of factors, like area size, source and year.

On 1/28/2024 at 12:11 PM, Chris Daley said:

Bangkok and Nonthaburi.  Nothing else exists.

Exactly. Let's just agree that Bangkok is number one, and Nonthaburi number two. The other cities rank different on each list.

2 hours ago, MarcelV said:

There are like a thousand top 10/20/whatever lists of city size in Thailand, and I've never seen two lists that are the same. Most vary wildly, depending on a whole bunch of factors, like area size, source and year.

Actually most lists are pretty close, and really depends if one knows what they are reading;

... population: municipality or metro area

... area; municipality or metro area

On 1/25/2024 at 9:20 PM, NorthernRyland said:

Pai has more people than Lampang, Lampun, Chiang Dao etc...

No, it was just a "culturally significant" town in Thailand, that I've visited.

 

Which is bigger than Chiang Dao, BTW.

 

OK, I added those places to my list...

 

==============================
Thailand Population (by metro area, per Google)
==============================
Bangkok        14,626,225
Chiang Mai      1,229,000
Hat Yai.               800,000
Chiang Rai.        557,000
Khon Kaen.        509,000
Surat Thani.       503,000
Lampang.           473,000
Phuket.               455,000
Udon Thani.        430,000
Lamphun.            334,000
Ubon Rat.           200,000
Nakhon Si T.       102,152
Koh Samui            70,000
Pai.                        27,370
Chiang Dao.          15,194
Koh Phagnan.       14,000
Koh Chang.             5,000