The Collum estate was centred on Belleview, near Enniskillen. However, John Collum, as representative of the late Archibold, of Enniskillen is recorded as owning 283 acres in Leitrim in the 1870s. In addition he is recorded as owning, with others, over 1600 acres in county Sligo. He also owned land in Cavan and Donegal as well as Fermanagh. Elizabeth Collum, together with Robert Orme, was a principal lessor in some parishes in Tireragh at the time of Griffith's Valuation, notably Skreen. Mrs. Elizabeth Collum, wife of John Collum, and Robert Orme, offered for sale property in Athlone and Westmeath, in the Encumbered Estates Court in February 1857. This had formerly been part of the estate of Ffolliott Thornton Mostyn and of Bernard Kelly.
National Archives of Ireland:
Encumbered Estates’ Court Rentals (O’Brien), Collum & Orme, 27 February 1857, Vol 44, MRGS 39/021, (microfilm copy in NUIG)