Mynyddygarreg is a small village situated about a mile and a half north east of Kidwelly. The first edition of the 25inch OS maps, published in 1880, does not record a village called Mynyddygarreg at all. Instead the area seems to consist primarily of scattered farmhouses, but there are also two significant industrial works nearby: Gwerndraeth Iron and Tin Plate Works (NPRN 40405) and Mynyddygarreg Lime works. Despite no evidence of a nucleated village-like settlement, there were a few amenities in the area. These included two public houses - Green Alley to the south west and the Lamb and Flag to the north east, and a Calvinistic or Primitive Methodist chapel called Horeb (NPRN 12650). When the second edition of the 25inch OS maps was published in 1906, the lime works were recorded as disused, but the Tinplate works remained in operation. The other significant change was that St. Teilo's mission church (NPRN 12651) had been built near the Green Alley public house, and the settlement had acquired a school to the south east of the disused lime works.
Neither of the public houses were open in 2018, although both the mission church and the Methodist chapel remain open. The iron and tinplate works have been transformed into the Kidwelly Industrial Museum, and the school remains open - educating approximately fifty children aged three to eleven through the medium of Welsh. Mynyddygarreg also has a community centre and a Rugby Football Club.
Sources: modern and historic OS maps; google street view; kidwellyindustrialmuseum.org.uk; Estyn report about Ysgol Gynradd Mynyddygraig published in June 2014
M. Ryder, RCAHMW, 3rd December 2018.