In 1828 Coolrain was spelt Coleraine and was in the parish of Offerlane, Queens County (which is now called County Laois) 
In 1855 Coolrain had a corn and flour mill, a dispensary and police barracks.
In 1901 the population of Coolrain's townlands, was 304, and by 1911 the population was 364. The townlands of Coolrain in 1901 and 1911 were: Anatrim/Anatrin, Coolnagour (1828 Colenagour), Coolrain (1828 Coleraine), Derryduff, Derrynaseera (1828 Dernaserea), Glebe, Larch Hill, Laurel Hill, Shanderry, Tinnakill (1828 Tennakilly).
- Tithe Applotment books Ireland
- Griffiths Valuation of Ireland
- Census of Ireland
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