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Cynwyl Gaeo is a parish and community located in rural Carmarthenshire, Wales, near the boundary with Ceredigion, in the upper Cothi valley about halfway between Lampeter and Llandovery. The population of the village at the United Kingdom Census 2011 was 940. It includes the villages of Caeo (or Caio), Crug-y-bar, Cwrtycadno, Ffarmers and Pumsaint.
The parish church of St Cynwyl in the village of Caeo is a Grade II* listed building.
The community is bordered by the communities of: Cilycwm; Llanwrda; Llansadwrn; Talley; Llansawel; Pencarreg; and Llanycrwys, all being in Carmarthenshire; and by Llanfair Clydogau and Llanddewi Brefi in Ceredigion.
- "Community population 2011". Retrieved 14 April 2015. CS1 maint: discouraged parameter (link)
- "Parish Church of St Cynwyl, Caeo, Cynwyl Gaeo". British Listed Buildings. Retrieved 21 December 2013. CS1 maint: discouraged parameter (link)
- "Ward population 2011". Archived from the original on 14 April 2015. Retrieved 14 April 2015. CS1 maint: discouraged parameter (link)