The Mills Society of Ireland

Historical Ordnance Survey Maps.  Put in the place name that you're interested in at the top left.

https://osi.maps.arcgis.com/apps/webappviewer/index.html?id=bc56a1cf08844a2aa2609aa92e89497e

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Griffiths Valuation 

https://www.askaboutireland.ie/griffith-valuation/

Interactive map with 5222 mills surveyed in Northern Ireland -Sebastian Graham.

http://www.millsofnorthernireland.com/

The 1821 to 1911 census.

https://census.nationalarchives.ie/pages/