I've two seperate Wilson lines - one from Offaly (Kings County) in Ireland, possibly originally from Northern Ireland and the other from Leeds, originally from Cambridgeshire.
My Sheridans are from Dublin city.
Modreeny town is near enough to Lough Derg 16km (~10 miles)
this is an extract of what is listed in Slaters Directory of 1894 for Modreeny
MODREENY, a parish in co. Tipperary, barony of Lower Ormond, in dispensary district of Cloghjordan in union of Borrisokane, Protestant diocese of Killaloe, 3 miles south-east from Borrisokane, with station at Cloghjordan on the Great Southern and Western
railway, containing 41 townlands and the village of Cloghjordan....
...area comprises 12,163 acres ; the population in 1891 was 1,640.
..
Letters through Cloghjordan E.S.O. CO. Tipperary
...The letter delivery route mentioned as Cloghjordan is a town which is on the way to the current town of Modreeny from Nenagh but much nearer.
A google search of the term 'post town' includes the following from Wikipedia and others : '
A post town is a required part of all postal addresses in the United Kingdom, and a basic unit of the postal delivery system. Including the correct post town in the address increases the chances of a letter or parcel being delivered on time.'
'Modreeny' does not appear in any of the earlier edition I have of Slaters (1846,71 & 81)
it appears that there was a Parish and a Townland by this name and there is currently a town of the name.
doing a search of all townlands in the Parish of Modreeny on
http://thecore.com/seanruadlists quite a few ~40, so it is possible that one of these is even nearer to Lough Derg or The Galway border.
I suppose it depends on wheather your source means the Town, Townland or Parish..
Shane