Salters Grange is a townland, in the parish of Grange, in Co Armagh. There were no Montgomery households listed in it in Griffiths Valuation of 1864 but the way I read Jane’s death notice, it was her who came from there, not Hugh, so we’d be looking for family with whatever her maiden name was, not Montgomery.
The Newry Telegraph of 12th August 1871 does have an advert from Hugh Montgomery of Fairview House, Grange, in which he is described as the proprietor of a 40 acre farm in Salter’s Grange, which he was putting up for sale. However the Valuation Revision records for that year don’t show him as landlord of any land in that townland. Possibly it was in his wife’s family’s name.
Salters Grange is a mile or two north of the city of Armagh. Today the modern Salter’s Grange Rd runs through the middle of it.
I can’t locate Fairview House. It had the postal address Grange which is the parish name, and is broadly an area around the town of Loughgall (including Salter’s Grange). I have had a look for Fairview on the Griffiths maps but don’t see it. You could try e-mailing the local studies section at Armagh Library. Someone there may have heard of it. I would mention that it existed in the 1800s, in case it’s not there today (which I suspect is the case):
The average house in rural Ireland didn’t have a name in the 1800s, nor a road name or house number. Normally your name and your townland were sufficient to identify you and get a letter delivered. Only wealthy folk had houses with names. So this is likely to have been a more significant property in the area.
Grange usually signifies land that once belonged to a monastery. So there are lots of townlands and areas called Grange, all over Ireland.