The National Provider Identifier website has an exhaustive list of Physical Therapists (PT) in Vermont.
Kids Rehab GYM also provides PT services in Vermont.
Please also ask your pediatrician or family physician for a referral. Then “ask around” of your family and friends, especially if they have a child on the spectrum. Ask school staff who you trust about a referral.
Investigate potential PTs to find out if they are trained and interested in servicing children with Autism. Also check what insurances they accept.