Dating back to 1780, the Journals of Diocesan Conventions and Councils collection is the accumulating archive of the published proceedings of annual diocesan conventions, which include the official record of the bishop diocesan's reports and addresses, clergy and parish lists, annual reports of diocesan agencies, parish statistical reports, diocesan budgets, and directories.

Additionally, the journals of Provinces I-IX and foreign dioceses and missionary districts are included in the archive.