Ongar is an outer western suburb of Dublin, Ireland. Developed on a greenfield basis since 2001, it comprises the townlands of Castaheany and "Hansfield or Phibblestown", within the ancient Barony of Castleknock, County Dublin. It is close to Castleknock, Blanchardstown and Clonsilla. The development has a number of amenities on the main street, ther…Ongar is an outer western suburb of Dublin, Ireland. Developed on a greenfield basis since 2001, it comprises the townlands of Castaheany and "Hansfield or Phibblestown", within the ancient Barony of Castleknock, County Dublin. It is close to Castleknock, Blanchardstown and Clonsilla. The development has a number of amenities on the main street, there are several schools in the area, and the nearby railway line at Hansfield railway station connects to the Luas Green Line and ultimately the N3 national route / M3 motorway. Employers in the nearby business parks and Greater Blanchardstown include Intel, Hewlett-Packard, IBM, Kepak and eBay.