A place I use a lot (and like in spite of the comment that follows) appears to have girls of only 2 heights if you read their website. I'd say about 80% of their girls are short (by which I mean less than about 5' 3)". They are all described on the website as being 5' 6", a height that several of them don't attain even in a pair of high heels. A few are truly tall - minimum 5' 9". They are all described on the website as being 5' 7"!!
Generally I'd concur with earlier comments that girls heights reflect the normal spread of the female population. I'm only 5' 6" but 2 of my favourite regulars are both about 5' 10"/11" and are among my all time top punts. One (sadly now in a different profession) was barking mad as well, which kinda makes things more edgy and exciting...
They all appear short when kneeling in front of me though
....but when they're sitting on my face they seem as tall as the Eifel Tower