The entire holdings of the Archiepiscopal Archives of Ljubljana amount to around 1,000 linear metres. The holdings are divided into six groups: (i) Diocesan Files - the files from the time of the central offices of the Diocese and the Ljubljana Diocesan collaborators (1491-1960); (ii) Files of the Ljubljana Chapter (1394-1951); (iii) Bequests of the bishops, priests and others - 250 inheritances of the Ljubljana bishops, priests and laymen (16th century-present); (iv) Societies - files of 20 societies, mostly church societies from the end of 19th century and the first half of the 20th century; (v) Parish archives - transcripts of parish registers for the entire diocese since 1832, the aim being to order and register all parish archives including the parishes of the Novo mesto Diocese; and (vi) Collections - 21 collections, including collections of manuscripts, photographs, plans and maps (1140-2005).

Documents must be ordered at least one day in advance by phone or in person. According to the rules, one can take photocopies or photographs of some written files. Information on the Archives can be obtained from employees of the Archiepiscopal Archives or the publications Guide to the Funds and Collections of the Archiepiscopal Archives in Ljubljana (1999), Guide to the Parish Registers of the Archiepiscopal Archives in Ljubljana (2003) by Tone Krampač, and Chapter Archives in Ljubljana (2006) by Lilijana Žnidaršič Golec.