The manuscripts collections of the Society contain a wealth of material documenting religious institutions and organizations, religious leaders, and the religious activities and beliefs of congregants, from the beginning of European settlement to the present.
Institutions and organizations with records at the Society include denominational records (for the Episcopal and Congregational churches), individual parishes and churches, and everything from missionary societies to women's groups to hospitals. Individuals range from bishops to rabbis, from missionaries to parishioners, from philanthropists to historians.
The denominations best represented in the Society's manuscript collections are:
Lesser, though still substantial, material can be found relating to the following:
The Society's holdings also include scattered material relating to other denominations.
Three denominations maintain their own archives in the state. However, the Society's collections include material relating to these denominations, collected before the establishment of their archives. These denominations are: