I am Hmong and I live in Arizona. I heard there are Hmong people here but I have never met one maybe because there's not that many Hmong people here and even if you were to cross one you will never know they are Hmong if you don't go up and talk to them. I mean, I wouldn't be able to tell whether they're Hmong if I were to see a Hmong person while out doing grocery shopping or something... I would assume they're Lao, Thai, Chinese, Korean or other Asian ethnicity because there's a lot of them here.
So to answer your question, yes there are Hmong people in AZ but maybe only a total of 10 people lol for the record in 2013.