6922 Brennan returns for Ireland which includes those who were renting land and those who acted as 'sub-landlords.'
155 Brannan returns for Ireland
36 Brannon returns for Ireland
As you search please remember that the spelling of family names is not standardised in Ireland until the mid 20th century.
Antrim
Brennan 46 returns
Brannan 2
Brannon 2 returns
Armagh
Brennan 58
Carlow
Brennan 224
Brannan 1
Cavan
Brennan 26
Brannon 1
Clare
Brennan 102
Cork
Brennan 112
Brannon 1
Donegal
Brennan 114
Brannan 4
Brannon 3
Down
Brennan 101
Brannan 14
Brannon 1
Dublin
Brennan 242
Brannan 21
Brannon 15
Dublin City
Brennan 15
Fermanagh
Brennan 24
Galway
Brennan 157
Brannan 1
Galway Town
Brennan 8
Kerry
Brennan 288
Kildare
Brennan 178
Brannan 9
Brannon 2
Kilkenny
Brennan 1952
King's County/Offaly
Brennan 48
Brannon 1
Leitrim
Brennan 37
Brannan 14
Brannon 1
Limerick
Brennan 110
Brannan 1
Londonderry/Derry
Brennan 27
Brannan 12
Longford
Brennan 43
Brannon 1
Louth
Brennan 209
Brannan 1
Mayo
Brennan 322
Brannan 10
Meath
Brennan 82
Brannan 24
Monaghan
Brennan 167
Brannan 5
Queen's County/Laois
Brennan 566
Roscommon
Brennan 417
Brannan 8
Brannon 2
Sligo
Brennan 372
Brannan 12
Tipperary
Brennan 11
Tipperary, North Riding
Brennan 88
Tipperary, South Riding
Brennan 91
Tyrone
Brennan 29
Brannan 4
Brannon 1
Waterford
Brennan 85
Brannan 6
Westmeath
Brennan 123
Brannan 6
Brannon 5
Wexford
Brennan 219
Wicklow
Brennan 53
Source
www.askaboutireland.ie/griffith-valuation/