LLANGARREN, LLANGARRON, or LLANGARRAN, is an extensive parish situated in the southern portion of the county, on the Garron Brook, one of the tributaries of the River Wye, celebrated for its excellent trout fishing. It is distant 5½ miles S.W. of Ross, 7 N. of Monmouth, and 13 S. of Hereford; it is in Wormlow hundred (lower division), Ross union and county court district, Whitchurch polling district, and Harewood End petty sessional division. The population in 1861 was 1,215; in 1871, 1156; inhabited houses, 252; families or separate occupiers, 265; area of parish, 5,450 acres; annual rateable value, £9,115. It is in several manors. Chandos Wren Hoskyns, Esq. (the Lord of the manor or hundred of Wormelow), The Governors of Guy's Hospital, Sir Joseph Russell Bailey, Bart, M.P., Thomas Mayos, Esq., John Jones, Esq., Thomas Berrow, Esq., and the Rev. Henry John Potts, B.A., are the principle landowners. The soil is sandy and loamy; subsoil, chiefly sandstone rock; produce wheat, barley, roots, &c. Llangarren is in the diocese and archdeaconry of Hereford and rural deanery of Archenfield; living, a vicarage annexed to St. Weonard's chapelry; joint value, £506, with 67 acres of glebe; patrons, the Dean and Chapter of Hereford; vicar, Rev. Henry John Potts B.A., of Trinity College, Cambridge, who was instituted in 1854.

The church, dedicated to St. Deinst, is an ancient stone edifice in the Anglo-Norman style of architecture, with tower and spire, nave, chancel, side aisle, porch, font, four monuments, and 475 sittings. The earliest register is dated 1569. There is a national school for boys and girls, with a certified master under government inspection; average attendance, about 50. Langstone Court, the seat of John Jones, Esq., M.D., J.P., is an ancient mansion, supposed to have been built by Inigo Jones. Trecilla House is the property and residence of the Rev. Henry John Potts, B.A. Long-Grove, or Llangrove, formerly a hamlet to Llangarren, is now an ecclesiastical parish, and will be found under a separate heading. Kilrhyg, or Kilreague, distant 1 mile W., Llangunnock and Treribble, 2 miles N.W., Langstone, ½ N.E., Treburnfrey, 1 mile N., Biddlestone, 2 miles N.E., Trecilla, to the E., Trerees, ½ mile S., and Trevervan, 1 mile S., are all places or townships in this parish.