Historic Counties Institute

Geography • Identity • Continuity

Reference, evidence, and public education for the historic counties.

Historic counties are the enduring geography. Councils are administration, lieutenancies are ceremonial – neither define the counties.

County Dossier

Louth

A small county of coasts, passes and early monasteries.

Louth is Ireland's smallest county, lying on the east coast between the Boyne estuary and Carlingford Lough. Despite its size, it contains varied landscapes including the Cooley Peninsula, open lowland and old monastic districts.

Louth county reference map

At a glance

Louth at a glance

A small county of coasts, passes and early monasteries.

Nation Ireland
Formal name County Louth
  • Ireland's smallest county
  • County by the medieval period
  • Cooley, Boyne mouth and Carlingford Lough
  • Area: 319 sq miles / 826 sq km
  • Population: 122,897
  • County Top: Slieve Foy (1,932ft / 589m)

County Geography

Louth meets Armagh to the north-west, Monaghan to the west, Meath to the south, Down across Carlingford Lough and the Newry side to the north, and the Irish Sea forms the county’s eastern edge. The county is shaped by the Cooley heights, the Boyne estuary, the Carlingford inlet, and the narrow belt of low country between them.

Louth is easy to recognise through Cooley, Carlingford, the Boyne mouth, and the east-coast plain.

Map Reference

View Louth on the map

Louth is the county. The map shows its boundary, places, and neighbouring counties.

Open Louth in the Interactive Map

Places and routes

Dundalk, Drogheda, Ardee, Carlingford, and Monasterboice show the county from its two main towns and inland crossing point to its north-coast harbour and early monastic centre.

Connections

The county’s routes have long run north from Drogheda to Dundalk, branched inland through Ardee, and turned toward Carlingford and the Ulster approaches. Movement follows the same coastal corridor, plain, and peninsula pattern.

Louth landscape or key location
Carlingford, County Louth.

Names

  • Louth
  • County Louth
  • County of Louth

Lú is the Irish form of Louth. County Louth is the formal historical style, the county name is linked to the older place-name of Louth and the god Lugh, and the older background reaches into Uriel or Oriel and the Airgíalla side of the north-east.

Louth was a county by the medieval period, and its compact strip between Boyne and Carlingford still reads as one clear historic county.

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County Reference

Explore Louth

Open the map to explore Louth, or return to the county index to browse other counties.