There were 49 windmills in Anglesey, the most of any county in Wales.
[1] See List of windmills in Anglesey.
[1] There was one windmill in Conwy County Borough.
[1] There were twelve windmills in Glamorgan,[1] not including the Titt engine.
Text in italics denotes indicates that the information is not confirmed, but is likely to be the case stated.