Trinity Park School was established in 1898, under headmaster J.F. Bivins, to better prepare students for admission at Trinity College and other institutions. The school operated on the campus of Trinity College until 1922, when it was permanently closed. The Trinity Park School Collection includes bound volumes, print materials, the papers of headmaster F.S. Aldridge, and photographs, and financial information. Annual Trinity Park School catalogs have been removed and cataloged separately.

The Trinity Park School Collection includes bound volumes, print materials, and photographs. The Bound Volumes Series contains accounting ledgers, a grade book, minute books, and a roll book. Trinity Park School's annual catalogs have been removed and cataloged separately. These materials offer insight into the students at the school, their courses of study, and their financial situations.

The second series, Print Materials, contains financial information, correspondence, illustrated booklets, and other documents related to Trinity Park School.

The third series, F.S. Aldridge Papers, contains the correspondence of the headmaster of Trinity Park School. It dates primarily from 1921 and 1922, when the school was closed.

The final series, Photographs, includes photos of students, faculty, buildings, and other images from the school. Oversized photographs can also be found in this series.