Go to other sites, and get ask to have a link made to your site. The more links you have, the more google reads your site as "relevent" during searches.
The name of the site itself is the biggest point.
Example. I have a business, and I had a domain name that was cute and said what I did, but then came across a person that simply said "put the name of your city in your domain." Now obviously this is different than your situation, but it might click something with you.
The point is, now when people in my state google for my service, my domain name is practically what they will be searching for... so its the first to pop up because it fits their search criteria.
So perhaps a domain name like "PheonixAutismSupportGroup.com"... or something similar so that when they type in google "Autism Support, Pheonix AZ"..your domain name hits that search precisely.
(the previous comment was not directed at any particular individual and was not intended to slander,disrespect or offend any reader of said statement)