Question: is co monaghan in northern ireland?
Answer: County Monaghan. County Monaghan (/ˈmɒnəhən/; Irish: Contae Mhuineacháin) is a county in Ireland. ... Following the 20th-century Irish War of Independence and the signing of the Anglo-Irish Treaty, Monaghan was one of three Ulster counties to join the Irish Free State rather than Northern Ireland.