Below is a list of all the Sinclairs recorded in Griffith’s Valuation published between 1847 and 1864. Only the map references, the names of the lessors, and the annual rateable values of land and buildings have been omitted to make the table easier to use. For full details, search the Name Index at the Griffith’s Valuation website.

Some Sinclairs were also lessors, but this information is only important to know when calculating the total amount of land each held. Most just leased it for their own use as farmers, except for James and William Sinclair of Holyhill, who owned many thousands of acres in Tyrone and Donegal. Most of these were leased to native Irish farmers, particularly in Donegal. Where their names appear in this table they were holding land in their own right and employing others to work it.

There were just over a hundred individual Sinclair names recorded by Griffith, which represents a tiny percentage of the total number. It was a snapshot of land ownership in one specific year, ranging from single house-owners, small-holders living on a few acres, urban businesses with shops and stores, to families holding vast estates. What it does not record are the many landless labourers who rented rooms and cottages, but never owned them, when the population of Ireland was just over four million.