Depends on whether you're an adult or a kid. If you're over 18, I wasn't able to get anyone to look at me. Of course, I was old when I was dx (46). They don't like oldies. If you're under, well, boy howdy, you're in luck. I had to be dx by a British AS researcher.
Places to look:
seattleaspergers.org/diagnosisandtherapy.aspx
That will give you a ton of information, but check out each person or group carefully. SOme are full of woo, and others are more science based.
Another place to check if you're under 18 is the University of Washington. They have a program there as well. Oh, and Swedish Hospital, but I'm not sure if they will dx adults.
Metta.