| Name | Location | County | Country | Power source | Type | Function | River |
| Felin Isaf, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Corn mill | Trystion |
| Pandy Cynwyd, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Fulling mill | Trystion |
| Pentre Llawen Woollen Factory, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Trystion |
| Prince's Yard Factory, Cynwyd | Cynwyd | Merionethshire | United Kingdom | Water | Watermill | Woollen mill | Trystion |