# List of standardised Welsh place-names in Carmarthenshire

The list of standardised Welsh place-names, for places in Carmarthenshire, is a list compiled by the Welsh Language Commissioner to recommend the standardisation of the spelling of Welsh place-names, particularly in the Welsh language and when multiple forms are used, although some place-names in English were also recommended to be matched with the Welsh. The list contains 356 entries, as of November 2023.
The list is based on recommendations provided by the Place-names Standardisation Panel, convened by the Commissioner, for expert advice on the standardisation of Welsh place-names. The panel bases their decisions on a set of guidelines (currently dating to June 2023), specific to Welsh settlement names (such as those of villages, towns, and cities) and topographic features (such as lakes, mountains and rivers). The panel does not cover house or building names, although similar principles could be applied to them or to names for new developments (for which the Commissioner offers their own advice to local authorities and housing developers). The panel may also have used additional guidelines.
The list was first published in 2018, and took years to put together. Upon creation, these lists were published under the Open Government Licence 3.0.

## List

| Recommended standardised names | Recommended standardised names | Other name/spelling not recommended | Type | Grid reference |
| Welsh | English | Other name/spelling not recommended | Type | Grid reference |
| Aberarad | Aberarad | Aber-arad | Settlement | SN3140 |
| Aberbowlan | Aberbowlan | | Settlement | SN6938 |
| Aberduar | Aberduar | | Settlement | SN5244 |
| Abergiâr | Abergiâr | Aber-giar | Settlement | SN5040 |
| Aberglasne | Aberglasney | | Settlement | SN5822 |
| Abergorlech | Abergorlech | | Settlement | SN5833 |
| Abergwili | Abergwili | | Settlement | SN4321 |
| Aberhalen | Aberhalen | | Settlement | SN3340 |
| Aber-lash | Aber-lash | | Settlement | SN6214 |
| Aber-nant | Aber-nant | Abernant | Settlement | SN3323 |
| Achddu | Achddu | | Settlement | SN4401 |
| Allt | Allt | | Settlement | SN5502 |
| Alltwalis | Alltwalis | | Settlement | SN4431 |
| Ashfield | Ashfield | | Settlement | SN6928 |
| Babel | Babel | | Settlement | SN8335 |
| Bancffosfelen | Bancffosfelen | | Settlement | SN4811 |
| Bancycapel | Bancycapel | | Settlement | SN4315 |
| Bancyfelin | Bancyfelin | | Settlement | SN3218 |
| Banc-y-ffordd | Banc-y-ffordd | | Settlement | SN4037 |
| Bancymansel | Bancymansel | | Area | SN5214 |
| Bethlehem | Bethlehem | | Settlement | SN6825 |
| Y Betws | Y Betws | Betws | Settlement | SN6311 |
| Bigyn | Bigyn | | Settlement | SS5199 |
| Blaenhalen | Blaenhalen | | Settlement | SN3339 |
| Blaen-nos | Blaen-nos | | Settlement | SN7534 |
| Blaen-waun | Blaen-waun | Blaenwaun | Settlement | SN2327 |
| Blaen-y-coed | Blaen-y-coed | Blaenycoed | Settlement | SN3427 |
| Bola-haul | Bola-haul | Bolahaul | Settlement | SN4218 |
| Bont-fawr | Bont-fawr | Bont Fawr | Settlement | SN7125 |
| Box | Box | | Settlement | SN5100 |
| Brechfa | Brechfa | | Settlement | SN5230 |
| Broadlay | Broadlay | | Settlement | SN3709 |
| Broadway | Broadway | | Settlement | SN2910 |
| Broadway | Broadway | | Settlement | SN3808 |
| Bronwydd | Bronwydd | | Settlement | SN4124 |
| Brook | Brook | | Settlement | SN2609 |
| Brynaman | Brynaman | Brynamman | Settlement | SN7114 |
| Brynaman Uchaf | Brynaman Uchaf | | Area | SN7114 |
| Bryn-du | Bryn-du | | Settlement | SN5309 |
| Brynmyrddin | Brynmyrddin | | Settlement | SN4421 |
| Brynteifi | Brynteifi | | Area | SN4539 |
| Bwlchnewydd | Bwlchnewydd | | Settlement | SN3624 |
| Cae’r-bryn | Cae’r-bryn | | Settlement | SN5913 |
| Caeo | Caeo | Caio | Settlement | SN6739 |
| Caerfyrddin | Carmarthen | | Settlement | SN4120 |
| Capel | Capel | | Area | SN5200 |
| Capel Dewi | Capel Dewi | | Settlement | SN4720 |
| Capel Gwynfe | Capel Gwynfe | | Settlement | SN7222 |
| Capel Hendre | Capel Hendre | | Settlement | SN5911 |
| Capel Isaac | Capel Isaac | | Area | SN5826 |
| Capel Iwan | Capel Iwan | | Settlement | SN2936 |
| Capel Seion | Capel Seion | | Settlement | SN5113 |
| Carmel | Carmel | | Settlement | SN5816 |
| Carreg Cennen | Carreg Cennen | Carreg Cennan | Man-made feature | SN6618 |
| Carwe | Carwe | Carway | Settlement | SN4606 |
| Castellnewydd Emlyn | Newcastle Emlyn | | Settlement | SN3040 |
| Castellyrhingyll | Castellyrhingyll | | Area | SN5714 |
| Cefn-bryn-brain | Cefn-bryn-brain | | Settlement | SN7413 |
| Cefncaeau | Cefncaeau | | Area | SS5399 |
| Cefneithin | Cefneithin | | Settlement | SN5513 |
| Cefn-y-pant | Cefn-y-pant | | Settlement | SN1925 |
| Cenarth | Cenarth | | Settlement | SN2641 |
| Cilsân | Cilsân | Cilsane | Settlement | SN5922 |
| Cil-y-cwm | Cil-y-cwm | Cilycwm | Settlement | SN7540 |
| Cilymaenllwyd | Cilymaenllwyd | | Parish | SN1424 |
| Cloigyn | Cloigyn | | Settlement | SN4314 |
| Coopers | Coopers | | Settlement | SN5910 |
| Croesyceiliog | Croesyceiliog | | Settlement | SN4016 |
| Cross Hands | Cross Hands | | Settlement | SN5612 |
| Cross Inn | Cross Inn | | Settlement | SN2912 |
| Crosshands | Crosshands | | Settlement | SN1922 |
| Crug-y-bar | Crug-y-bar | Crugybar | Settlement | SN6537 |
| Crwbin | Crwbin | | Settlement | SN4713 |
| Cwm Capel | Cwm Capel | | Area | SN4502 |
| Cwm-ann | Cwm-ann | Cwmann | Settlement | SN5847 |
| Cwm-bach | Cwm-bach | Cwmbach | Settlement | SN2525 |
| Cwm-byr | Cwm-byr | | Settlement | SN6332 |
| Cwmcarnhywel | Cwmcarnhywel | | Area | SN5300 |
| Cwm-cuch | Cwm-cuch | Cwmcych | Settlement | SN2736 |
| Cwm-du | Cwm-du | | Settlement | SN6330 |
| Cwmduad | Cwmduad | | Settlement | SN3731 |
| Cwmdŵr | Cwmdŵr | | Settlement | SN7032 |
| Cwmdwyfran | Cwmdwyfran | | Settlement | SN4126 |
| Cwmfelin-boeth | Cwmfelin-boeth | | Settlement | SN1919 |
| Cwmfelinmynach | Cwmfelinmynach | Cwmfelin Mynach | Settlement | SN2224 |
| Cwm-ffrwd | Cwm-ffrwd | Cwmffrwd | Settlement | SN4217 |
| Cwmgwili | Cwmgwili | | Settlement | SN5710 |
| Cwmhiraeth | Cwmhiraeth | | Settlement | SN3437 |
| Cwmifor | Cwmifor | | Settlement | SN6525 |
| Cwmisfael | Cwmisfael | | Settlement | SN4915 |
| Cwmllethryd | Cwmllethryd | | Settlement | SN4911 |
| Cwm-mawr | Cwm-mawr | | Settlement | SN5312 |
| Cwm-miles | Cwm-miles | | Settlement | SN1622 |
| Cwm-morgan | Cwm-morgan | | Settlement | SN2934 |
| Cwmoernant | Cwmoernant | | Area | SN4121 |
| Cwm-pen-graig | Cwm-pen-graig | Cwmpengraig | Settlement | SN3436 |
| Cwm-y-glo | Cwm-y-glo | | Settlement | SN5513 |
| Cwrt-henri | Cwrt-henri | | Settlement | SN5522 |
| Cwrtycadno | Cwrtycadno | | Settlement | SN6944 |
| Cydweli | Cydweli | Kidwelly | Settlement | SN4006 |
| Cynghordy | Cynghordy | | Settlement | SN8040 |
| Cynheidre | Cynheidre | | Settlement | SN4907 |
| Cynwyl Elfed | Cynwyl Elfed | | Settlement | SN3727 |
| Dafen | Dafen | | Settlement | SN5201 |
| Danrhelyg | Danrhelyg | | Settlement | SN2939 |
| Derwen-fawr | Broad Oak | | Settlement | SN5722 |
| Derwydd | Derwydd | | Settlement | SN6117 |
| Dinas | Dinas | | Settlement | SN2730 |
| Dre-fach | Dre-fach | | Settlement | SN2920 |
| Dre-fach | Dre-fach | | Settlement | SN5213 |
| Dre-fach | Dre-fach | | Settlement | SN6516 |
| Dre-fach Felindre | Dre-fach Felindre | | Settlement | SN3538 |
| Drefelin | Drefelin | | Settlement | SN3638 |
| Dryslwyn | Dryslwyn | | Settlement | SN5520 |
| Efail-wen | Efail-wen | Efailwen | Settlement | SN1325 |
| Esgair | Esgair | | Settlement | SN3728 |
| Esgairdawe | Esgairdawe | | Settlement | SN6140 |
| Felindre | Felindre | | Settlement | SN3538 |
| Felindre | Felindre | | Settlement | SN5521 |
| Felindre | Felindre | | Settlement | SN7027 |
| Felin-foel | Felin-foel | Felinfoel | Settlement | SN5202 |
| Felin-gwm Isaf | Felin-gwm Isaf | | Settlement | SN5023 |
| Felin-gwm Uchaf | Felin-gwm Uchaf | | Settlement | SN5024 |
| Felin-wen | Felin-wen | | Settlement | SN4621 |
| Ffair-fach | Ffair-fach | Ffairfach | Settlement | SN6221 |
| Ffaldybrenin | Ffaldybrenin | | Settlement | SN6344 |
| Ffarmers | Ffarmers | | Settlement | SN6544 |
| Fferws Hill | Fferws Hill | | Settlement | SN6011 |
| Fforest | Fforest | | Settlement | SN5804 |
| Ffwrnais | Furnace | | Settlement | SN5001 |
| Ffynnon | Ffynnon | | Settlement | SN3516 |
| Ffynnon-ddrain | Ffynnon-ddrain | | Settlement | SN4021 |
| Foelgastell | Foelgastell | | Settlement | SN5414 |
| Y Garnant | Y Garnant | Garnant | Settlement | SN6813 |
| Gelli-aur | Golden Grove | | Settlement | SN5819 |
| Gelli-wen | Gelli-wen | | Settlement | SN2723 |
| Glanaman | Glanaman | Glanamman | Settlement | SN6713 |
| Glanduar | Glanduar | | Area | SN5243 |
| Glandŵr | Glandŵr | | Settlement | SN2641 |
| Glandy Cross | Glandy Cross | | Settlement | SN1426 |
| Glangwili | Glangwili | | Area | SN4322 |
| Glanmwrwg | Glanmwrwg | | Settlement | SN5501 |
| Glanyfferi | Ferryside | | Settlement | SN3610 |
| Glan-y-môr | Seaside | | Area | SS5099 |
| Glyn-teg | Glyn-teg | | Settlement | SN3637 |
| Gors-goch | Gors-goch | | Settlement | SN5713 |
| Gors-las | Gors-las | Gorslas | Settlement | SN5713 |
| Y Graig | Y Graig | | Settlement | SN4401 |
| Gwernogle | Gwernogle | | Settlement | SN5334 |
| Gwyddgrug | Gwyddgrug | | Settlement | SN4635 |
| Halfpenny Furze | Halfpenny Furze | | Settlement | SN2713 |
| Halfway | Halfway | | Settlement | SN5200 |
| Halfway | Halfway | | Settlement | SN8232 |
| Harford | Harford | | Settlement | SN6343 |
| Hebron | Hebron | | Settlement | SN1827 |
| Yr Hendy | Yr Hendy | Hendy | Settlement | SN5803 |
| Hendy-gwyn ar Daf | Whitland | | Settlement | SN2016 |
| Henllan Amgoed | Henllan Amgoed | | Settlement | SN1820 |
| Heol-ddu | Heol-ddu | | Settlement | SN4603 |
| Heolgaled | Heolgaled | | Settlement | SN6226 |
| Hermon | Hermon | | Settlement | SN3630 |
| Hiraeth | Hiraeth | | Settlement | SN1721 |
| Hopkinstown | Hopkinstown | | Area | SN6412 |
| Horeb | Horeb | | Settlement | SN4905 |
| Horeb | Horeb | | Settlement | SN5128 |
| Idole | Idole | | Settlement | SN4215 |
| Iet-y-bwlch | Iet-y-bwlch | | Settlement | SN1628 |
| Lacharn | Laugharne | | Settlement | SN3010 |
| Llanarthne | Llanarthne | Llanarthney | Settlement | SN5320 |
| Llanboidy | Llanboidy | | Settlement | SN2123 |
| Llan-dawg | Llan-dawg | | Settlement | SN2811 |
| Llanddarog | Llanddarog | | Settlement | SN5016 |
| Llanddeusant | Llanddeusant | | Settlement | SN7724 |
| Llanddowror | Llanddowror | | Settlement | SN2514 |
| Llandeilo | Llandeilo | | Settlement | SN6222 |
| Llandybïe | Llandybïe | Llandybie | Settlement | SN6115 |
| Llandyfaelog | Llandyfaelog | | Settlement | SN4111 |
| Llandyfân | Llandyfân | | Settlement | SN6417 |
| Llandyry | Llandyry | | Settlement | SN4304 |
| Llanedi | Llanedi | | Settlement | SN5807 |
| Llanegwad | Llanegwad | | Settlement | SN5121 |
| Llanelli | Llanelli | | Settlement | SN5000 |
| Llanfallteg | Llanfallteg | | Settlement | SN1519 |
| Llanfihangel-ar-arth | Llanfihangel-ar-arth | Llanfihangel-ar-Arth | Settlement | SN4539 |
| Llanfihangel-uwch-Gwili | Llanfihangel-uwch-Gwili | | Settlement | SN4822 |
| Llanfynydd | Llanfynydd | | Settlement | SN5527 |
| Llangadog | Llangadog | | Settlement | SN4207 |
| Llangadog | Llangadog | | Settlement | SN7028 |
| Llan-gain | Llan-gain | Llangain | Settlement | SN3815 |
| Llangathen | Llangathen | | Settlement | SN5822 |
| Llangeler | Llangeler | | Settlement | SN3739 |
| Llangennech | Llangennech | | Settlement | SN5501 |
| Llanglydwen | Llanglydwen | | Settlement | SN1826 |
| Llangyndeyrn | Llangyndeyrn | | Settlement | SN4514 |
| Llangynin | Llangynin | | Settlement | SN2519 |
| Llangynnwr | Llangynnwr | Llangunnor | Settlement | SN4320 |
| Llangynog | Llangynog | | Settlement | SN3316 |
| Llanllawddog | Llanllawddog | | Settlement | SN4529 |
| Llan-llwch | Llan-llwch | Llanllwch | Settlement | SN3818 |
| Llanllwni | Llanllwni | | Settlement | SN4939 |
| Llanmilo | Llanmilo | Llanmiloe | Settlement | SN2508 |
| Llannewydd | Newchurch | | Settlement | SN3824 |
| Llan-non | Llan-non | | Settlement | SN5308 |
| Llanpumsaint | Llanpumsaint | | Settlement | SN4129 |
| Llansadwrn | Llansadwrn | | Settlement | SN6931 |
| Llansadyrnin | Llansadyrnin | | Settlement | SN2810 |
| Llan-saint | Llan-saint | Llansaint | Settlement | SN3808 |
| Llansawel | Llansawel | | Settlement | SN6136 |
| Llansteffan | Llansteffan | | Settlement | SN3510 |
| Llanwinio | Llanwinio | | Settlement | SN2626 |
| Llanwrda | Llanwrda | | Settlement | SN7131 |
| Llan-y-bri | Llan-y-bri | Llanybri | Settlement | SN3312 |
| Llanybydder | Llanybydder | | Settlement | SN5244 |
| Llan-y-crwys | Llan-y-crwys | Llanycrwys | Settlement | SN6245 |
| Llanymddyfri | Llandovery | | Settlement | SN7634 |
| Llidiadnennog | Llidiadnennog | | Settlement | SN5437 |
| Llwynhendy | Llwynhendy | | Settlement | SS5499 |
| Llwyn-teg | Llwyn-teg | | Settlement | SN5508 |
| Llwyn-y-brain | Llwyn-y-brain | | Settlement | SN1915 |
| Login | Login | | Settlement | SN1623 |
| Machynys | Machynys | | Settlement | SS5198 |
| Maenlle-gwaun | Maenlle-gwaun | | Settlement | SN3536 |
| Maenordeilo | Maenordeilo | Manordeilo | Settlement | SN6626 |
| Maerdy | Maerdy | | Settlement | SN6220 |
| Maes-y-bont | Maes-y-bont | Maesybont | Settlement | SN5616 |
| Maesycrugiau | Maesycrugiau | | Area | SN4741 |
| Marros | Marros | | Settlement | SN2008 |
| Meidrim | Meidrim | | Settlement | SN2820 |
| Merthyr | Merthyr | | Area | SN3520 |
| Milo | Milo | | Settlement | SN5917 |
| Morfa | Morfa | | Settlement | SN5712 |
| Morfa | Morfa | | Area | SS5198 |
| Morfa-bach | Morfa-bach | | Settlement | SN3613 |
| Myddfai | Myddfai | | Settlement | SN7730 |
| Myddynfych | Myddynfych | | Settlement | SN6213 |
| Mynyddcerrig | Mynyddcerrig | | Settlement | SN5013 |
| Mynyddygarreg | Mynyddygarreg | Mynydd-y-Garreg | Settlement | SN4208 |
| Nantgaredig | Nantgaredig | | Settlement | SN4921 |
| Nant-y-bai | Nant-y-bai | | Settlement | SN7744 |
| Nant-y-caws | Nant-y-caws | Nantycaws | Settlement | SN4518 |
| Nant-y-ffin | Nant-y-ffin | | Settlement | SN5532 |
| Nantyrhibo | Nantyrhibo | | Area | SN6223 |
| Neuadd | Neuadd | | Settlement | SN6921 |
| New Inn | New Inn | | Settlement | SN4736 |
| Pant-y-caws | Pant-y-caws | Pant-y-Caws | Settlement | SN1426 |
| Pantycendy | Pantycendy | | Area | SN3423 |
| Pantyffynnon | Pantyffynnon | | Area | SN6210 |
| Parc-y-rhos | Parc-y-rhos | | Area | SN5746 |
| Pedair-hewl | Four Roads | | Settlement | SN4409 |
| Pemberton | Pemberton | | Area | SN5300 |
| Pen-boyr | Pen-boyr | Penboyr | Settlement | SN3536 |
| Pen-bre | Pen-bre | Pembrey | Settlement | SN4201 |
| Pencader | Pencader | | Settlement | SN4436 |
| Pencarreg | Pencarreg | | Settlement | SN5345 |
| Penceiliogi | Penceiliogi | Penceilogi | Area | SN5300 |
| Pendderi | Pendderi | | Settlement | SN5400 |
| Peniel | Peniel | | Settlement | SN4324 |
| Pen-lan | Pen-lan | | Area | SN3040 |
| Pen-plas | Pen-plas | | Settlement | SN3517 |
| Penrherber | Penrherber | | Settlement | SN2838 |
| Penrhiw-goch | Penrhiw-goch | | Area | SN5518 |
| Pen-sarn | Pen-sarn | | Settlement | SN4119 |
| Pentowin | Pentowin | | Settlement | SN2918 |
| Pentrecagal | Pentrecagal | | Settlement | SN3440 |
| Pentre-cwrt | Pentre-cwrt | Pentrecwrt | Settlement | SN3838 |
| Pentrefelin | Pentrefelin | | Settlement | SN5923 |
| Pentregwenlais | Pentregwenlais | | Settlement | SN6016 |
| Pentremorgan | Pentremorgan | | Settlement | SN4025 |
| Pentre-poeth | Pentre-poeth | | Area | SN4115 |
| Pentre-poeth | Pentre-poeth | | Area | SN5001 |
| Pen-twyn | Pen-twyn | | Settlement | SN5611 |
| Pentywyn | Pendine | | Settlement | SN2308 |
| Pen-y-banc | Pen-y-banc | | Settlement | SN6111 |
| Pen-y-banc | Pen-y-banc | | Settlement | SN6124 |
| Pen-y-bedd | Pen-y-bedd | | Settlement | SN4102 |
| Pen-y-bont | Pen-y-bont | | Settlement | SN3027 |
| Pen-y-fai | Pen-y-fai | | Area | SN4901 |
| Pen-y-fan | Pen-y-fan | | Area | SS5199 |
| Pen-y-garn | Pen-y-garn | | Area | SN5731 |
| Pen-y-groes | Pen-y-groes | | Settlement | SN5813 |
| Pibwr-lwyd | Pibwr-lwyd | | Settlement | SN4118 |
| Picton Ferry | Picton Ferry | | Area | SN2717 |
| Pinged | Pinged | | Area | SN4203 |
| Plashett | Plashett | | Settlement | SN2709 |
| Pontaman | Pontaman | Pontamman | Settlement | SN6412 |
| Pontantwn | Pontantwn | | Settlement | SN4413 |
| Pontargothi | Pontargothi | Pont-ar-Gothi | Settlement | SN5021 |
| Pontarllechau | Pontarllechau | | Area | SN7224 |
| Pont-ar-sais | Pont-ar-sais | Pontarsais | Settlement | SN4428 |
| Pont-henri | Pont-henri | Pont Henri | Settlement | SN4709 |
| Pont-iets | Pont-iets | Pontyates | Settlement | SN4608 |
| Pontnewydd | Pontnewydd | | Settlement | SN4407 |
| Pont-tyweli | Pont-tyweli | Llandysul | Settlement | SN4140 |
| Pontyberem | Pontyberem | | Settlement | SN5011 |
| Pontyfelin | Pontyfelin | | Settlement | SN5312 |
| Pontyfenni | Pontyfenni | | Settlement | SN2317 |
| Porth Tywyn | Burry Port | | Settlement | SN4401 |
| Porth-y-rhyd | Porth-y-rhyd | | Settlement | SN5115 |
| Porth-y-rhyd | Porth-y-rhyd | | Settlement | SN7137 |
| Pump-hewl | Five Roads | | Settlement | SN4805 |
| Pumsaint | Pumsaint | | Settlement | SN6540 |
| Pwll-trap | Pwll-trap | | Settlement | SN2616 |
| Ram | Ram | | Settlement | SN5846 |
| Rhandir-mwyn | Rhandir-mwyn | Rhandirmwyn | Settlement | SN7843 |
| Rhos | Rhos | | Settlement | SN3835 |
| Rhosaman | Rhosaman | | Settlement | SN7314 |
| Rhos-goch | Red Roses | | Settlement | SN2011 |
| Rhos-maen | Rhos-maen | | Settlement | SN6323 |
| Rhosyn-coch | Rhosyn-coch | | Settlement | SN2921 |
| Rhydaman | Ammanford | | Settlement | SN6212 |
| Rhydargaeau | Rhydargaeau | | Settlement | SN4326 |
| Rhydcymerau | Rhydcymerau | | Settlement | SN5738 |
| Rhydodyn | Edwinsford | | Man-made feature | SN6334 |
| Rhydowen | Rhydowen | | Area | SN1928 |
| Rhydsarnau | Rhydsarnau | | Area | SN5710 |
| Rhyd-wen | Rhyd-wen | | Area | SN7313 |
| Rhydwilym | Rhydwilym | | Settlement | SN1124 |
| Rhydyfelin | Rhydyfelin | | Settlement | SN2837 |
| Rhyd-y-wrach | Rhyd-y-wrach | | Settlement | SN1619 |
| Sanclêr | St Clears | | Settlement | SN2716 |
| Saron | Saron | | Settlement | SN3737 |
| Saron | Saron | | Settlement | SN6012 |
| Siloh | Siloh | | | SN7437 |
| Sylen | Sylen | | Settlement | SN5106 |
| Taliaris | Taliaris | | Area | SN6428 |
| Talog | Talog | | Settlement | SN3325 |
| Talyllychau | Talley | | Settlement | SN6332 |
| Tanerdy | Tanerdy | | Settlement | SN4221 |
| Tanglwst | Tanglwst | | Settlement | SN3134 |
| Temple Bar | Temple Bar | | Settlement | SN5817 |
| Tir Syr Walter | Tir Syr Walter | | Area | SN6913 |
| Tir-y-dail | Tir-y-dail | | Area | SN6213 |
| Trap | Trap | | Settlement | SN6518 |
| Travellers Rest | Travellers Rest | | Settlement | SN3819 |
| Tre loan | Johnstown | | Settlement | SN3919 |
| Trebedw | Trebedw | | Settlement | SN3640 |
| Trefechan | Trevaughan | | Settlement | SN4021 |
| Tregynnwr | Tregynnwr | | Area | SN4119 |
| Treherbert | Treherbert | | Settlement | SN5846 |
| Tre-lech | Tre-lech | Trelech | Settlement | SN2830 |
| Tre-lech a'r Betws | Tre-lech a'r Betws | | Settlement | SN3026 |
| Tre-wen | Tre-wen | Tre-Wen | Settlement | SN2941 |
| Trimsaran | Trimsaran | | Settlement | SN4505 |
| Trostre | Trostre | | Area | SS5299 |
| Twynllannan | Twynllannan | | Settlement | SN7524 |
| Tŷ-croes | Tŷ-croes | Tycroes | Settlement | SN6010 |
| Tyle | Tyle | | Settlement | SN6726 |
| Tŷ-mawr | Tŷ-mawr | | Settlement | SN5442 |
| Y Tymbl | Y Tymbl | Tumble | Settlement | SN5411 |
| Tŷ'r-frân | Tŷ'r-frân | | Area | SN5101 |
| Waunclunda | Waunclunda | | Area | SN6831 |
| Waungilwen | Waungilwen | | Settlement | SN3439 |
| Waun-y-clun | Waun-y-clun | | Settlement | SN4504 |
| Wern | Wern | | Area | SS5099 |
| Ysbyty | Ysbyty | | Settlement | SS5598 |
| Ystradowen | Ystradowen | | Settlement | SN7512 |