The Archives of ARCASJ is open to the public Monday to Friday from 9:00 am to 4:00 pm. Inquiries are handled by mail or telephone, or by visit. Advance notice of extensive research is required. Appointments are required as there is limited research space. Photocopying services are available on site at cost subject to availability of staff. Some records are restricted and reproductions of photographs may be ordered at cost.

The Archdiocesan Archives is the main repository for the historical and contemporary documents of the R.C. Catholic Church of Newfoundland. Some of those holdings include: papers of the Bishops (1784-1979); Clergy files; Estates and Wills; Parishes of the Archdiocese; Vatican publications; Educational records and reports; The Monitor (1934-1996); photographs; parish baptisms, marriages and mortuary records (1763-1850). A finding aid is available for the researchers.