Historic Counties Institute

Geography • Identity • Continuity

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

Counties are geography. Councils run services, lieutenancies are ceremonial – neither defines the counties.

County Dossier

Carlow

A border county of river valleys and old strongholds.

Carlow is an inland county of south-eastern Leinster, shaped by the River Barrow and the rise of the Blackstairs Mountains along its eastern edge.

Carlow county reference map

At a glance

Carlow at a glance

A border county of river valleys and old strongholds.

Nation Ireland
Formal name County Carlow
Foundation 1210
  • 1210 – Uí Cheinnselaig
  • From Ceatharlach, "place of cattle"
  • Formed from earlier territories of South Leinster
  • Area: 346 sq miles / 896 km²
  • Population: 54,612
  • County Top: Mount Leinster (2,605ft / 794m)

County Geography

Carlow meets Kildare to the north, Wicklow to the east, Wexford to the south-east, Kilkenny to the south-west, and Laois to the west and north-west. The county is shaped by the Barrow valley, the line of the Blackstairs Mountains, and the lower inland plain between them.

Carlow is easy to read through the Barrow valley, the central plain, and the Blackstairs edge.

Map Reference

View Carlow on the map

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

Open Carlow in the Interactive Map

Places and routes

Carlow, Tullow, Leighlinbridge, Bagenalstown, and Borris show the county from its central plain and Barrow corridor to its southern and eastern sides.

Connections

The county’s routes have long followed the Barrow, crossed through Carlow town and Leighlinbridge, and run south and east toward Bagenalstown, Borris, and the Blackstairs side. Movement follows the same river-and-plain structure.

Carlow landscape or key location
Nurney, County Carlow.

Names

  • Carlow
  • County Carlow
  • County of Carlow

Ceatharlach is the Irish form of Carlow. County Carlow is the formal historical style, and the county name itself comes from Ceatharlach.

Carlow was a county by the thirteenth century. Its older identity is tied to the Barrow, the Blackstairs side of south-eastern Leinster, river crossings, castle sites, and the settled agricultural plain.

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County Reference

Explore Carlow

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