This
county constituency comprised the central part of
County Armagh. To the north was North Armagh, to the west were South Tyrone and North Monaghan, to the south were South Monaghan and South Armagh and to the east was West Down.
1885–1922: The baronies of Armagh and Tiranny, that part of the barony of Oneilland West not contained within the constituency of
North Armagh, that part of the barony of Fews Lower contained within the parishes of Kildarton and Mullaghbrack, the parish of Lisnadill excluding the townlands of Ballymacnab, Cashel, Foley and Seagahan, and the townlands of Corhammock and Edenykennedy in the parish of Kilclooney, that part of the barony of Orior Lower consisting of that part of the parish of Kilmore not contained within the constituency of North Armagh and the townlands of Aughlish, Ballymore, Ballysheil Beg, Ballysheil More, Cargans, Clare, Cloghoge, Coolyhill, Derryallen, Drumnaleg, Druminure, Drumnaglontagh, Lisbane, Lisnakea, Mavemacullen, Monclone, Moodoge, Mullantur, Mullaghglass, Terryhoogan, Tullyhugh and Tullymacann in the parish of Ballymore, and that part of the barony of Fews Upper consisting of the townland of Lisnadill. Prior to the
1885 United Kingdom general election and from the dissolution of Parliament in 1922 the area was part of the
Armagh constituency. ==Politics==