ADDERGOOLE, a parish, in the barony of TYRAWLEY, county of MAYO, and province of CONNAUGHT, 5 miles (S. by E.) from Crossmolina; containing 6725 inhabitants. This parish is situated on Lough Conn, by which it is bounded on the north, and on the road from Crossmolina to Castlebar: it contains within its limits the greater portion of the stupendous mountain of Nephin, which rises to a height of 2640 feet above the level of the sea. The land generally is under an improved system of tillage; there are large tracts of bog and mountain, which have been reclaimed to a great extent; and limestone abounds in the parish. Castle Hill is the seat of Major Cormick; Woodpark, beautifully situated on Lough Conn, of J. Anderson, Esq.; and Carrowkeel, of W. Bourke, Esq. A fair is held at Laherdane on the 29th of June, and at Ballagheen on the 24th of June. The parish is in the diocese of Killala; the rectory is partly appropriate to the precentorship, and partly to the vicars choral, of the cathedral of Christchurch, Dublin; the vicarage forms part of the union of Crossmolina. The tithes amount to £250, of which £13. 10. is payable to the precentor, £111. 10. to the vicars choral, and £125 to the vicar. The R. C. parish is co-extensive with that of the Established Church; the chapel is at Laherdane. There are two public schools, in which are about 130 boys and 30 girls; and six hedge schools, in which are about 160 boys and 70 girls. There are some remains of an old abbey at Addergoole, and also at Bofinan; and near Castle Hill are vestiges of an ancient castle.