I'm sure this has come up before, so I know I'm not treading new ground, but it's an ongoing frustration that all of the Asian providers are lumped in together.  If anyone has any tips or tricks for distinguishing the Thai providers from say, the Korean ones, it would be appreciated.  Thanks!

**My own opinion**

Most legit agencies will tell you what nationality the girls are.  An example is in the link below.  There is always a demand for Japanese girls, so girls who are Korean-Japanese mix are almost always advertised as Japanese.  We also get some girls who are 100% Japanese.   Viet girls are in demand as well, and are always advertised as Vietnamese by the agencies.  The only ones you have to be leery of are Chinese girls that are not identified as Chinese.  If an agency is known to conceal this info, and I find out upon showing up,  I will never patronize them again.  However, this rarely happens, as most reviewers will put the girl's nationality in their review if is it not declared in web ad, so the reviews are another place to look before you book.  

While recently the discussion here has include more references to non-Korean providers overwhelmingly the discussion is about K-Agencies and the K-Girls that work at those locations -- and to some extent the K-Girls that work as independents (yes, I know some what to claim the indies are not K-Girls but I don't buy into that view -- if they provide the same level of service and largely follow the same operational model I see no need to require an agency).

Thanks all, I appreciate your replies.  And thanks CDL, that's the first time I've seen an agency be that specific about nationalities.  In the spa world you mostly run into Koreans, while the apartments will offer Japanese, at least in my area.  But finding Thai seems to be a mystery.

I've had plenty of friends and coworkers who were born and raised in China, Japan, etc. and were visiting or working in the US. Although it didn't come up a lot, it was clear that even native natives can't always tell just by looks. ("Hay Imp, Do you know that girl over there? Do know if she is Chinese or Japanese?" "I don't know her. Do you mean you can't tell either?" "Nope!")
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There are a few features that experts can narrow down to ancestral geographic regions (e.g., northeastern Chinese provinces vs SW provinces), but there has been more mobility and mixing and dilution for the past many decades: NE Chinese marrying southern Chinese and having kids with a mix of those subtle physical features.  (Similar arguments made based on ethnicities rather than geographies: Han Chinese marrying Zhuong Chinese, and so on.)  
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A friend of mine had a pretty coworker named Zhu (pronounced like Jew) and he asked her if she was a Zhu. At first she said, "Yes, I'm Zhu." "Great! Then we can get married!" and she said, in Chinese, "You wish, you white hairy devil." [rim shot]

either you can or you can't.  there is no "way" to do it.  however, there's a pretty big diff between korean and thai people.  it's when you try to discern koreans from chinese or japanese it can get tricky.    usually, japanese have bigger eyes.  chinese have smaller frames.  koreans have bigger faces.  

If they give shitty service they're Chinese

Ive had both great and lousy service given to me by all nationalities.

The funny thing is that the asians do claim they know. I’ve had discussions with various asian friends and they say there are subtle differences that they recognize. But it beats the hell out of me.

Our Kgirls get Asian customers of many nationalities, and they seem to be able to know what country they are from just by looking at them.  BUT, on the other hand, I was at a Civvie Chinese girl's house last week waiting for a washer/dryer repairman so we could go out to lunch before an afternoon of sex.  The guy walked in and she started talking to him in Chinese, and he said, "Sorry, I only speak Korean and English" (I started laughing at her embarrassment - lol), so whatever the cues are that the Kgirls are seeing, not all Asians can tell by appearance alone.  I've seen over a thousand different providers (some many times) that were Kgirl, Jgirl, Thai, Pinay and Viet, and I'm only right about half the time on looks alone.

I would wonder how much that is about cultural behavioral traits over physical attributes. But  I don't think all Asians make that claim either so....

first type is the classic Korean beauty - the ones have all the so-called Korean facial features, the ones when you see them at first sight, you'd immediately recognize and say "WOW, what a pretty/sexy Korean girl!"

hot Asian women.  From this bunch, the girl I'd most like to fuck is number 16.  Others I would do in a heartbeat, not in order a preference . . . . .  1, 2, 4, 6, 9, 15.  Thanks for providing my afternoon fantasy.  Lol

I'm Strongly Biased towards Korean then Japanese Beauties
In Order of My Preference...

Not bad for two guys who don't know each other.  The reason it wasn't more is because 5 and 7 seen a little young for my tastes and 20 seemed a little old.  Of course, that's from a face-only perspective.  If they take off their clothes, I might not even notice their face.  Lol

It's interesting, I consider myself an Asian woman lover yet I don't think I'd give any of these women more than a "8" face-wise... preferences are a thing I guess lol

At least guys here don't buy into the media pushing grannies/fuglies like Sandra Oh and Margaret Cho.

CDL, knowing  you know a lot of Korean girls, you like Korean girls & you date Korean girls, however, you probably didn't follow Kpop or watch Korea drama. That explains you don't like Yoona of Girls' Generation or Suzy of Miss A.  
And, you probably wasn't too much into billiard either, otherwise, you will know the sexy black widow.

(which I thank you for posting) she looks a lot younger and would definitely put her on my list, so we overlap on another one.  

I don't just click on to another channel after about 2 minutes.

CDR, I know you saw Candy when you were in London.  Have you ever met anyone like her stateside?  Thanks!