Llanarmon Dyffryn Ceiriog is approximately 15km (9 miles) south west of Chirk on the B4500 road. It is 11km (7 miles) south west of Llangollen and 14km (9 miles) to the west of Oswestry. The village lies almost at the head of the Ceiriog valley, approximately 870 feet above sea level in the folds of the Berwyn Mountains. 

The conservation area encompasses the historic village centre.

The Llanarmon Dyffryn Ceiriog Conservation Area was first designated in August 1975 and its boundary amended in February 2000. The Llanarmon Dyffryn Ceiriog Conservation Area Character Assessment and Management Plan was adopted in March 2010.