These registers have been available on FindMyPast since last October (see blogpost) as a fully indexed record set covering about half the island.
The counties featured are Armagh, Fermanagh, Down, Limerick, Mayo, Meath, Tyrone, Roscommon, Westmeath, Wexford and Wicklow.
You'll find a list of the precise constituency/polling districts here.
Choose how you want to explore this collection:
Electoral Registers Indexed, or
Electoral Registers Browse.