The village sprang up within the
townland of
Coolmallish or
Coolmillish (), on the road between
Armagh and
Newry. It began to grow during the
Plantation of Ulster as a town for Scottish and English migrants.
The Troubles During
the Troubles, there were a number of incidents in Markethill, including a number which resulted in fatalities. • On 24 June 1979 an off-duty UDR soldier was shot dead by the IRA while at his home in Markethill, County Armagh. • On 22 October 1982 an off-duty UDR soldier (Thomas Cochrane) was kidnapped while travelling to work, Glennane, near Markethill, County Armagh. Found shot dead at Lislea, near
Camlough, County Armagh, seven days later on 29 October 1982. • On 16 November 1982 the
Irish National Liberation Army (INLA) shot dead two RUC officers (Ronald Irwin and Snowdon Corkey) at a security barrier in Markethill. INLA members fired several shots from a car before turning around and escaping the village. • On 8 September 1992 the IRA shot and critically wounded a Protestant civilian at his home near Markethill, County Armagh. Afterwards the IRA claimed he was a member of the British Army's Royal Irish Regiment. == Places of interest ==