The Co. Sligo Heritage and Genealogy Centre has uploaded more than 3,000 civil registration marriage records to the RootsIreland.ie database. The transcriptions have been made direct from the local custody marriage registers for the following districts:
Collooney: 1864–1923 (1040 records)
Geevagh: 1864–1928 (890 records)
Riverstown: 1864–1928 (1321 records)
Looking at the list of this Centre's online sources, I think these latest additions mean that transcriptions for ALL marriages registered in County Sligo from 1864 to the 1920s are now searchable on the RootsIreland database.