Merionethshire
Historic counties data provided by Association of British Counties / Historic Counties Trust.
| Name | Location | County | Country | Power source | Type | Function | River |
| Alwen Saw Mill, near Maerdy | Llandderfel | Merionethshire | United Kingdom | Water | Watermill | Saw mill | Alwen |
| Bettws Gwerfil Goch Mill, Bettws Gwerfil Goch | Bettws Gwerfil Goch | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Alwen |
| Cerist Mill, Dinas Mawddwy | Dinas Mawddwy | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Maesglase Stream |
| Chaff mill, Gerddi Bluog, Llanfair | Llanfair | Merionethshire | United Kingdom | Water | Watermill | Farm mill, Hulling mill | |
| Chaff mill, Uwchlawr-coed, Llanbedr | Llanbedr | Merionethshire | United Kingdom | Water | Watermill | Farm mill, Hulling mill | |
| Charlotte Elizabeth Mill, Gwynfynydd Gold Mine, Ganllwyd | Ganllwyd | Merionethshire | United Kingdom | Water | Watermill | Crushing mill, Mine mill/wheel | Mawddach |
| Cirisi Mill, Dinas Mawddwy | Dinas Mawddwy | Merionethshire | United Kingdom | Water | Watermill | ||
| Dolmelynllyn Mill, Ganllwyd | Ganllwyd | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Gamlan |
| Dolobran Mill, Dinnas Mawddwy | Dinas Mawddwy, Mawddwy | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Cerist |
| Dressing mills, Maenofferen Slate Mine, Blaenau Ffestiniog | Blaenau Ffestiniog, Ffestiniog | Merionethshire | United Kingdom | Electricity, Water | Watermill | Saw mill | Bowydd |
| Factory Fawr, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Arran |
| Factory Isaf, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Aran/Arran |
| Felin Isaf, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Trystion |
| Felin Newydd, Rhydymain | Rhydymain, Brithdir and Llanfachreth | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Wnion |
| Felin Sylfaen, Llanaber | Llanaber, Barmouth | Merionethshire | United Kingdom | Water | Watermill | Tributary to Dwynant | |
| Felin Ty'n y Nant, Maentwrog | Maentwrog | Merionethshire | United Kingdom | Water | Watermill | ||
| Felin Uchaf, Llandderfel | Llandderfel | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Tributary to Dee |
| Felin yr Ynys, Bryn-crug | Bryn-crug | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Fathew |
| Felin-y-Ffridd, Ffridd Gate | Pennal | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Dulas |
| Fron-Goch Factory, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Aran/Arran |
| Fulling mill, Aberllefenni | Aberllefenni, Corris | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Nant Ceiswyn |
| Fulling mill, Glyndyfrdwy | Glyndyfrdwy, Corwen | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Nant y Pandy |
| Fulling mill, Pantperthog | Pennal | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Dulas |
| Graig Ddu Slate Works, Blaenau Ffestiniog | Blaenau Ffestiniog, Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | |
| Gwynfryn Mill, Llanbedr | Llanbedr | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Artro |
| Hen-haford Saw Mill, Llanfor | Llanfor, Llandderfel | Merionethshire | United Kingdom | Water | Watermill | Saw mill | Meloch |
| Idris Factory, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Aran |
| Llwydiarth Hall Waterwheel, Aberllefeni | Aberllefeni | Merionethshire | United Kingdom | Water | Watermill | Electricity generating mill | |
| Llwyn Saw Mill, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Saw mill | Wnion |
| Maes-y-pandy Mill, Llanfihangel-y-pennant | Llanfihangel-y-pennant | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Dysynni |
| Melin Meloch, Llanfor | Llanfor | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Meloch |
| Melin Pantperthog, Pantperthog | Pennal | Merionethshire | United Kingdom | Water | Watermill | Corn mill, Fulling mill | Dulas |
| Melin y Glyn, Llandrillo | Llandrillo | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Llynor |
| Moelwyn Mill, Tan-y-Grisiau | Tan-y-Grisiau, Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Barlwyd |
| Old Gwynfryn Mill, Llanbedr | Llanbedr | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Artro |
| Pancy Bach, Llanelltyd | Llanelltyd | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Tributary of Wnion |
| Pandy Clywedog, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Saw mill, Woollen mill | Clywedog |
| Pandy Cynwyd, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Trystion |
| Pandy Dolau Gwyn, Pandy, Bryn-crug | Pandy, Bryn-crug | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Cwm-pandy |
| Pandy Gadair, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Aran/Arran |
| Pandy Glasdir, Llanfachreth | Llanfachreth, Brithdir and Llanfachreth | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Las or Babi |
| Pandy Gwylan, Gellilydan | Gellilydan, Maentwrog | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Tafarn-helyg |
| Pandy Hafod Dywyll, Kings, Arthog | Arthog | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Gwynant |
| Pandy Nant-yr-Ehedydd, Cwm Cewydd | Cwm Cewydd, Mawddwy | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Clywedog |
| Pandy Odyn, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Tributary to Wnion |
| Pandy Pant Phylip, Arthog | Arthog | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Arthog |
| Pandy Pentre, Llanelltyd | Llanelltyd | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Tributary to Mawddach |
| Pandy Stukeley, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Aran/Arran |
| Pandy, Cefn-ddwysarn, Bala | Bala, Llandderfel | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Nant Cefn-Coch |
| Pandy, Corris | Corris | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Dulas |
| Pandy, Esgair Wen | Brithdir and Llanfachreth | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Tributary to Wnion |
| Pandy, Ffestiniog | Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Corn mill, Fulling mill | Teigl |
| Pandy, Tal-y-Bont | Tal-y-Bont, Dyffryn Ardudwy | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Ysgethin |
| Pandy, Trawsfynydd | Trawsfynydd | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Prysor |
| Pant-yr-ynn Slate Mill, Bethania, Blaenau Ffestiniog | Bethania, Blaenau Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Slate mill, Woollen mill | Afon Du-bach |
| Pentre Llawen Woollen Factory, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Trystion |
| Perth-y-cyttiau saw mill, Bryn-crug | Bryn-crug | Merionethshire | United Kingdom | Water | Watermill | Saw mill | Fathew |
| Pont Barker Bark Mill, Druid | Druid, Corwen | Merionethshire | United Kingdom | Water | Watermill | Bark mill | Alwen |
| Prince's Yard Factory, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Trystion |
| Rhaiadr y Pandy, Llanfrothen | Llanfrothen | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Croesor |
| Saw mill, Abergynolwyn | Abergynolwyn | Merionethshire | United Kingdom | Water | Watermill | Saw mill | Nant Gwernol |
| Slate mill, Aberllefenni | Aberllefenni, Corris | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Dulas |
| Slate mill, Drum Slate Quarry, Blaenau Ffestiniog | Blaenau Ffestiniog, Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Gamallt |
| Slate mill, Minllyn Quarry, Minllyn | Minllyn, Mawddwy | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | Nant Minllyn |
| Slate mill, Rhyd-y-sarn | Llan Ffestiniog, Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill, Tannery | Teigl |
| Slate mill, Wrysgan Quarry, Blaenau Ffestiniog | Wrysgan Quarry, Blaenau Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | |
| Slate mills, Croesor Quarry, Croesor | Croesor Quarry, Croesor | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel, Slate mill | |
| Tan-y-Bwlch Saw Mill, Tan-y-Bwlch | Tan-y-Bwlch,Maentwrog | Merionethshire | United Kingdom | Water | Watermill | Saw mill | Llyn Mair |
| Torrent Walk Mill, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Clywedog |
| Tyddyn-pandy, Llanaber | Llanaber, Barmouth | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Tributary to Dwynant |
| Upper Mill, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Arran |
| Upper Mill, Llanfair | Llanfair | Merionethshire | United Kingdom | Water | Watermill | ||
| Upper Neint Factory, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Aran/Arran |
| Watermill, Blaenau Festininog | Blaenau Festininog | Merionethshire | United Kingdom | Water | Watermill | ||
| Watermill, Bont Ddu | Bont Ddu | Merionethshire | United Kingdom | Water | Watermill | ||
| Watermill, Bryn-y-Foel Isaf, Dyffryn Ardudwy | Dyffryn Ardudwy | Merionethshire | United Kingdom | Water | Watermill | Farm mill, Hulling mill | |
| Watermill, Corwen | Corwen | Merionethshire | United Kingdom | Water | Watermill | ||
| Watermill, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Tributary to Wnion |
| Watermill, Llwyngwril | Llwyngwril | Merionethshire | United Kingdom | Water | Watermill | ||
| Watermill, Nant-Caw-Fawr, Llanfihangel-y-pennant | Llanfihangel-y-pennant | Merionethshire | United Kingdom | Water | Watermill | Farm mill | Nant Caw |
| Watermill, Presteigne | Presteigne | Merionethshire | United Kingdom | Water | Watermill | ||
| Waterwheel, Conglog Slate Quarry, Blaenau Ffestiniog | Conglog Slate Quarry, Blaenau Ffestiniog | Merionethshire | United Kingdom | Water | Watermill | Quarry mill/wheel | |
| Waterwheel, Dyffrydan | Dyffrydan, Arthog | Merionethshire | United Kingdom | Water | Watermill | ||
| Wenallt Factory, Dolgellau | Dolgellau | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Aran/Arran |
| Woollen Factory, Cefn-ddwysarn, Bala | Bala, Llandderfel | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Mynach |
| Woollen factory, Tal-y-bont | Tal-y-bont | Merionethshire | United Kingdom | Water | Woollen mill | Afon Ysgethin | |
| Woollen mill, Pandy'r Capel | Pandy'r Capel, Gwyddelwern | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Clwyd |