County
Antrim
Armagh
Carlow
Cavan
Clare
Cork
Donegal
Down
Dublin
Fermanagh
Galway
Kerry
Kildare
Kilkenny
Kings
Leitrim
Limerick
Londonderry
Longford
Louth
Mayo
Meath
Monaghan
Queens
Roscommon
Sligo
Tipperary
Tyrone
Waterford
Westmeath
Wexford
Wicklow
 

(Click on one of the counties to the left.)
Notes:

List of Cities and just over 900 Towns in Ireland with a population of 120 or greater in 1871, based on details extacted from the census of that year.

Some towns are on the borders of counties and so appear in both.

A number of county borders were revised in the late 1800s and resulted in a small number of towns being assigned to a neighbouring county - e.g. Ballaghadereen moved to Co. Mayo from Co. Roscommon.
Details published in Thom's directory of 1879.