Unfortunately, there is not a central data collection organization for Montessori schools. However, I will give you my estimation of the information about schools based on our two years experience of building our lists and gathering information about schools. As far as school size, the average size seems to range between 100 and 150 students. They range from the smallest school we know of in Florida with 9 students to a school in Forest Lake, CA with 450 students. At this point we only have 32 identified schools with middle school programs.
Budgets are going vary greatly depending on how much a school charges for tuition.
Budgets for Charter and Magnet schools are generally higher than for private schools because of the source of their money. We have 317 charter, magnet and public Montessori schools in our list. Many schools do rent their facilities from churches or schools or businesses. Needless to say arrangements for facilities vary greatly. But, there is little information complied on the private Montessori schools.