County Monaghan

County Monaghan
Contae Mhuineacháin
Nicknames: 
The Drumlin County; The Farney County
Motto: 
Dúthracht agus Dícheall (Irish)
"Diligence and Best Endeavour"
Interactive map of County Monaghan
CountryIreland
ProvinceUlster
RegionNorthern and Western
Established1585
County townMonaghan
Government
 • Local authorityMonaghan County Council
 • Dáil constituencyCavan–Monaghan
 • EP constituencyMidlands–North-West
Area
 • Total
1,295 km2 (500 sq mi)
 • Rank28th
Highest elevation373 m (1,224 ft)
Population
 (2022)
 • Total
65,288
 • Rank28th
 • Density50.42/km2 (130.6/sq mi)
Time zoneUTC±0 (WET)
 • Summer (DST)UTC+1 (IST)
Eircode routing keys
A75, A81, H18, H23
Telephone area codesin the South of the County 042 - Carrickmacross and Castleblayney in the North of the County 047 - Clones and Monaghan
ISO 3166 codeIE-MN
Vehicle index
mark code
MN
WebsiteOfficial website

County Monaghan (/ˈmɒnəhən/ MON-ə-hən; Irish: Contae Mhuineacháin) is a county in Ireland. It is in the province of Ulster and is part of Border strategic planning area of the Northern and Western Region. It is named after the town of Monaghan. Monaghan County Council is the local authority for the county. The population of the county was 65,288, according to the 2022 census.

The county has existed since 1585 when the Mac Mathghamhna rulers of Airgíalla agreed to join the Kingdom of 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.