Donna Maughan is missing from the Blanchardstown area.
He was last seen at around 11am on Saturday 9 February near the Bonnington Hotel.
Shane O’Connor was last seen in the Woodpark area of Ballinteer.
Last month, remains found in 2001 were confirmed as belonging to the missing 20 year-old.
Fiona Fagan was last seen in the Kilcock area.
Dylan Lavele has been missing from Gyles Quay in Dundalk since last Saturday.
Adam Darcy was last seen in the Darndale area.