The townland of Coolmillish is in the parish of Mullaghbrack in Armagh County. It is labelled number 8 on the map.

The 1826 Schools Commission report describes the school in the townland:

"Markethill, Coolmalish - A pay school under the care of Daniel O'Neil, of the Roman Catholic denomination, who was in receipt of 50l per annum. The school was conducted in a good house, built at a cost of 150l. The school provided education for 23 scholars."

PRONI records: D.384/2 (Map of lower manor of Coolmillish, surveyed by Owen Sivan, estate of Sir Nicholas Acheson.); D.1606/1/228 (Rental.); D.603 (Survey of Gosford estate.); D.1606/6B/8 (Map, part of estate of Earl of Gosford, surveyed by Wm Greig and John Hill.); D.1606/6B/10 (Contents and valuations of part of property of Earl of Gosford, from surveys, etc., by Wm Greig andJohn Hill.); OS/6/2/17/1 (Surveyed 1835. Engraved 1835.); OS/6/2/17/2 (Surveyed 1835. Engraved 1835. Revised 1860. Engraved 1863.); OS/6/2/17/3 (Surveyed 1835. Revised 1906. Published 1908. Reprinted 1929, 1932.); OS/6/2/17/4 (Surveyed 1906. Revised 1954-5. Levelled 1889, 1892 and 1906. Published 1958 (2 copies).); VAL/1B/213 (1st valuation records.); VAL/12B/10/34A, VAL/12B/10/34B, VAL/12B/10/34C, VAL/12B/10/34D, VAL/12B/10/34E (Valuation annual revision list.); VAL/2B/2/12A (Griffith valuation list.).