Founded in 1963, the school is a non-profit corporation. It is accredited by the Association Montessori Internationale (AMI) and the Independent Schools Association of the Southwest (ISAS). The school serves approximately 400 students, from 14 months through high school. The classroom levels are Infant Community, Primary, Lower Elementary, Upper Elementary, Middle School, and High School. Each level consists of children in three-year age ranges (apart from middle school which has a two-year age range, and high school consisting of a four-year range).
The Post Oak High School is a private Montessori high school in the Museum District, Houston. As of 2011 the director is James Moudry. The high school opened in the northern hemisphere fall of 2012.
It is the first high school to open in the Museum District and it is the third Montessori high school in Houston.
In 2011 the school plans called for partnering with area medical institutions and museums. The school is in proximity to the Texas Medical Center. As of that year the tuition is $21,000 per year. The school plans to have a student population of 120. As of April 29, 2015 the high school has 34 students.
This list is incomplete. Italicized public schools are not in the "full purpose" Houston city limits (See map) but have portions of Houston in their attendance boundary, while italicized private schools are in municipalities that are surrounded by Houston and/or are in unincorporated areas but have Houston postal addresses.