Some sources anyway
The National Library of Ireland has a Consolidated Index To the Records of the
Genealogical Office Dublin, Ireland Compiled by Virginia Wade McAnlis
TEMPLETOWN/ TEMPLETON
...GO MS 125 Heraldic Sketches p.290
...GO MS 223-54 Betham Will Abstracts 6/250, 13/244, 16/301 or 361, 26/67
Baron (Upton)
...GO MS 186 Lords Entries Vol. IV, p.18
...GO MS 184 Lords Entries Vol. II, p.54
....GO MS 187 Lords Entries Vol. V, p.116
The public record office for Northern Ireland has 106 entries for Templeton under their name index. a further 303 entries in their e-catalogue which includes at least one Catherine templeton
North of Ireland Family History Society has had a genealogical index which is not availanle this am.
1660 locations in the Ulster hearth Money rolls
8623 1158 Antrim Dunluce Upper Ballymoney Culdoo 1 Qr of Coldone Mathew Templeton Templeton
9225 1760 Antrim Dunluce Lower Derrykeighan Ballynarry Upper Unnamed William Templetone Templeton
9341 1876 Antrim Dunluce Lower Derrykeighan Bellisle 2 Qrs of Inchgrane Adam Templeton Templeton
15827 2220 Antrim Belfast Lower Islandmagee Balloo Ballon Arch Templeton Templeton
15887 2280 Antrim Belfast Lower Islandmagee Ballyprior More Ballyprearmore Thomas Templeton Templeton
15911 2304 Antrim Belfast Lower Islandmagee Ballytober Ballytobber John Templeton Templeton
16526 137 Antrim Massereene Upper Blaris Lisburn Parish & Town Lisbourne Parish & Town Jo Templeton Templeton
17311 923 Antrim Massereene Upper Glenavy Glenavy Glenavey Towne Wm Templeton Templeton
Templeton in Co Down see over 60 entries in
http://freepages.genealogy.rootsweb.ancestry.com/~rosdavies/SURNAMES/T/TaTe.htm#teLeaving out the six counties of Northern Ireland the Templeton around 1830 were living principally in Donegal and Monaghan, with a couple in Queens County and one in Galway. see
http://titheapplotmentbooks.nationalarchives.ieAs there are titled Templeton both Lord and viscount etc , some trees will be available in Burkes Peerage and also Burkes Landed Gentry of Ireland