I just had my seat inspected yesterday. I went on this website https://www.nhtsa.dot.gov/cps/cpsfitting/Index.cfm and ended up speaking with someone in the Montco health department, they have stations set up. The one I went to was yesterday at a Fire Department in Montgomeryville. It was very helpful!
We went to the state police barracks in Neshaminy (Bucks co but really close to montco). Check out the state police website they have a lot of locations.
Re: Car Seat Inspection in Montco
I haven't done it yet, but found this info:
https://www.health.montcopa.org/health/cwp/view,A,3,Q,28155.asp