[2] The quest to establish that school became very important to Bishop Robert Woodward Barnwell Elliott, the dynamic leader of the Missionary District of Western Texas of the Episcopal Church.

The first official home of the school was located in the Wolfe Building at the corner of Navarro and Martin streets in downtown San Antonio, Texas.

[2] The reestablishment of Saint Mary's Hall in 1879 came at a time when Texas farmers, cattle barons, and traders were prospering and able to support the school.

[5] Faced with the need for expansion, the Board of Trustees decided that Saint Mary's Hall should develop a new campus to meet present needs and future demands.

[7] To design the new campus, the school hired the associated firms of San Antonio architects O'Neil Ford and Bartlett Cocke.

By the end of the 2012 - 2013 school year, the I AM Saint Mary's Hall campaign ended with the following accomplishments: the renovation and expansion of the Peggy Pitman Mays Dining Hall, construction of the Social Science & History Center, construction of the new Alonso Ancira Event Center, redesign of the existing McCombs Family Athletic Complex, the renovation of the Coates-Seeligson Theater/Chapel, and the new addition of the Kim & Rod Lewis Track & Field.

[12][13] In early 2014, Saint Mary's Hall invited the first undocumented immigrant to be admitted to the State Bar of California to be a speaker at their model United Nations conference.

Before uninviting Garcia, Saint Mary's Hall had described him as an “experienced and exciting keynote speaker” and had expressing how unfortunate that he had been waiting for a visa for 19 years.

[14] The Saint Mary's Hall alma mater was written by Caroline S. Cummins in 1928, and the music was composed by Mabel C. Osborne.

Each division gathers for a time of worship and reflection each Monday in order to be inspired through music, scripture readings, and stories of faith & service.

[16] In 1928, the first edition of the Saint Mary's Hall yearbook, La Reata, was published with a foreword written by Headmistress Ruth Coit.

"[12] The Saint Mary's Hall motto, “Teach us delight in simple things” first appeared on the French Place campus where it was set in bronzed lettering in the stone steps of the school building.

[15] Saint Mary's Hall students wear “ties” to signify their leadership roles in different organizations around the school.

Students wear formal dress uniforms to school every Monday and for special occasions such as Blue Tie Ceremony.

[21] The academic curriculum at Saint Mary's Hall is a mixture of English, Fine Arts, Mathematics, Science, Social Studies, and World Languages.

[23] The faculty attends (and is encouraged to seek out) professional enrichment opportunities in their subject areas to ensure students are learning from the most up-to-date curriculum and in the newest ways.

Students are exposed to world religions in Chapel, meet one-on-one with their college counselor, or help plan the annual Issues Day debate.

Saint Mary's Hall is also a member of the following national and regional organizations:[1] See also: List of museums in Central Texas