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Duhonw is a rural community in Powys, Wales, to the south of Builth Wells (Welsh: Llanfair ym Muallt), comprising scattered farms and dwellings. Covering an area of 4,376 hectares (16.90 sq mi), it is bounded to its north by the Afon Irfon, to its south by Mynydd Epynt and Banc y Celyn and to its east the rivers Duhonw and Wye (Afon Gwy). Llangammarch Wells' (Welsh: Llangamarch) is to its west.
Its population was 294, according to the 2011 census; a 2% fall since the 300 people noted in 2001.
The 2011 census showed 14.6% of the population could speak Welsh, a rise from 9.2% in 2001.
Duhonw Community Council was created following a 1985 review by the Local Government Boundary Commission for Wales, amalgamating the four small communities of Llanddewi'r Cwm, Llangynog, Llanynis and Maesmynis.
Duhonw is part of the Sennybridge Training Area, and is listed as a Site of Special Scientific Interest.