Blanchardstown (Irish: Baile Bhlainséir) is a large outer suburb of Dublin in the modern county of Fingal, Ireland. Located ten kilometres (6 mi) northwest of Dublin city centre, it has developed since the 1960s from a small village to a point where Greater Blanchardstown is the largest urban area in Fingal. It is within the historical barony of Castleknock in the traditional County Dublin, as well as the Dublin 15 postal area and the Dublin West electoral constituency.