1901 DED	1901 Townland	1911 Townland	1911 DED	Barony	Parish	Union
O'Brennan	Gortnaleaha Upper
O'Brennan	Ballincollig	Ballincollig	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Ballinknock	Ballinknock	O'Brennan	Trughanacmy	Ballymacelligott	Tralee
O'Brennan	Ballymullen	Ballymullen	O'Brennan
O'Brennan	Beennageeha	Beennageeha	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Beheenagh	Beheenagh	O'Brennan
O'Brennan	Carrignafeela	Carrignafeela	O'Brennan
O'Brennan	Crag	Crag	O'Brennan
O'Brennan	Esk	Esk	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Gortnaleaha	Gortnaleaha	O'Brennan
O'Brennan	Keam	Keam	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Kilduff	Kilduff	O'Brennan
O'Brennan	Kilmore	Kilmore	O'Brennan
O'Brennan	Knockariddane	Knockariddane	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Knocknagoun	Knocknagoum	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Lissooleen	Lissooleen	O'Brennan	Trughanacmy	Ballymacelligott	Tralee
O'Brennan	Maghanknockane	Maghanknockane	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Muingatlaunlush	Muingatlaunlush	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Muingavrannig	Muingavrannig	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Mweelinroe	Mweelinroe	O'Brennan	Trughanacmy	Ballymacelligott	Tralee
O'Brennan	Parkearagh	Parkearagh	O'Brennan	Trughanacmy	O'Brennan	Tralee
O'Brennan	Potaley	Potaley	O'Brennan	Trughanacmy	Ballymacelligott	Tralee
O'Brennan	Rathmore	Rathmore	O'Brennan
O'Brennan	Shanaknock	Shanaknock	O'Brennan
O'Brennan	Tursillagh	Tursillagh	O'Brennan
O'Brennan	Tylagh	Tylagh	O'Brennan	Trughanacmy	O'Brennan	Tralee