I can't speak for Montgomery County, but you can go to
www.buckscounty.org for info on the Board of Assessment. The millage rates listed on that website are accurate (I'm currently at 142, which is pretty high). In the town that I live the school millage rate is approved by the school board each year and the school district sends out the real estate tax notice and they are the contact for any questions on the school district real estate taxes. I then also also pay taxes to the township for real estate and for earned income. When I moved to Pennsylvania, I was very confused about all the taxes that are required. We had a very knowledgable realtor who was able to help us understand the property taxes. Hope this helps.