Town

Letterkenny

Leitir Ceanainn

Letterkenny’s river trade and market square preceded the cathedral project shaped by Bishop Patrick O’Donnell and emigrant support.

Watercolour and fine ink illustration of Cathedral of St Eunan and St Columba, Letterkenny, County Donegal in Letterkenny.
Illustration, Cathedral of St Eunan and St Columba, Letterkenny, County Donegal
Recorded locationLetterkenny54.96136° N · 7.72283° WInteractive map supplied by OpenStreetMap.
Recorded place location · Logainm.ie

The name

These Irish name elements are associated with this record in the Logainm glossary.

An element’s translation is a clue, rather than a complete explanation of the name. Its form and meaning depend on local history and the full Irish name.

Recorded forms

  • Leitir Ceanainn · Irish · main form · validated name
  • Letterkenny · English · main form

Place & story

A market at the head of navigation

Samuel Lewis described Letterkenny in 1837 as a town of one main street, a large market square and 416 houses. The Swilly was navigable from Lough Swilly to the town by vessels carrying 150 tons. Its Friday market and several annual fairs connected river transport with the surrounding countryside. Nearby resources included slate, building stone, marl and clay suitable for pottery and bricks. The river crossing, market and access to the lough supplied the town with several complementary sources of work. [2]

Courts, schools and churches

The directory records a courthouse, a six-cell bridewell and regular petty and quarter sessions. A dispensary and small fever hospital attended to illness, while a national school formed part of the town’s educational provision. Its places of worship included the parish church, a modest Catholic chapel and three Presbyterian meeting places representing different traditions. This was the town before the much larger Catholic cathedral rose above it at the end of the nineteenth century. [2]

People & connections

Patrick O’Donnell’s cathedral project

Bishop Patrick O’Donnell laid the foundation stone of the Cathedral of Saints Eunan and Columba on 6 September 1891. William Hague designed the building, which was constructed in Mountcharles sandstone. The project drew support from emigrant communities: priests travelled to America, Canada, England and Scotland to raise funds. Dedicated in June 1901, the cathedral contains glass made by the Mayer firm of Munich and work by the Pearse firm of Dublin. A statue of O’Donnell in the grounds commemorates the bishop’s part in bringing the project to completion. [3] [4]

Geographic information

Place type
Town
County
Donegal
Civil parish
Conwal
Coordinates
54.96136, -7.72283
Logainm ID
1417285 ↗

Population over time

Letterkenny — Census 2016 settlement footprint

Population within 2016 settlement boundaries

21,672people · 2022

07.5K15K22.5K30K 2016: 19,274 people20162022: 21,672 people2022

Both counts use the 2016 settlement boundary, allowing like-for-like comparison. CSO supplies the 2022 count on this older boundary for comparison only. The official 2022 Built Up Area has different boundaries.

View population figures
Letterkenny — Census 2016 settlement footprint — census population
Census yearPopulation
201619,274
202221,672

Source: CSO Census 2022 Profile 1 — Appendix Table 1: Census 2022 De Facto Population for the 2016 Towns · Supporting source 1. CC BY 4.0. Retrieved 2026-10-25.

Letterkenny Legal Town, Donegal — Legal town, CSO 2006 report

2002–2006: legal town

15,062people · 2006

05K10K15K20K 2002: 7,965 people20022006: 15,062 people2006

These are the historical areas published in the 2006 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.

View population figures
Letterkenny Legal Town, Donegal — Legal town, CSO 2006 report — census population
Census yearPopulation
20027,965
200615,062

Source: CSO C0112 — Alphabetical list of towns, populations 2002 and 2006 · Supporting source 1. CC BY 4.0. Retrieved 2026-10-25.

Letterkenny Environs, Donegal — Town environs only, CSO 2006 report

2002–2006: town environs only

2,524people · 2006

02K4K6K8K 2002: 7,266 people20022006: 2,524 people2006

These are the historical areas published in the 2006 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.

View population figures
Letterkenny Environs, Donegal — Town environs only, CSO 2006 report — census population
Census yearPopulation
20027,266
20062,524

Source: CSO C0112 — Alphabetical list of towns, populations 2002 and 2006 · Supporting source 1. CC BY 4.0. Retrieved 2026-10-25.

Letterkenny Legal Town, Donegal — Legal town, CSO 1996 report

1991–1996: legal town

7,606people · 1996

02K4K6K8K 1991: 7,186 people19911996: 7,606 people1996

These are the historical areas published in the 1996 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.

View population figures
Letterkenny Legal Town, Donegal — Legal town, CSO 1996 report — census population
Census yearPopulation
19917,186
19967,606

Source: CSO A0112 — Alphabetical list of towns, populations 1991 and 1996 · Supporting source 1. CC BY 4.0. Retrieved 2026-10-25.

Letterkenny Environs, Donegal — Town environs only, CSO 1996 report

1991–1996: town environs only

4,390people · 1996

01.3K2.5K3.8K5K 1991: 3,540 people19911996: 4,390 people1996

These are the historical areas published in the 1996 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.

View population figures
Letterkenny Environs, Donegal — Town environs only, CSO 1996 report — census population
Census yearPopulation
19913,540
19964,390

Source: CSO A0112 — Alphabetical list of towns, populations 1991 and 1996 · Supporting source 1. CC BY 4.0. Retrieved 2026-10-25.

Letterkenny, Donegal — Town environs only, CSO 1986 report

1981–1986: town environs only

3,118people · 1986

01K2K3K4K 1981: 2,298 people19811986: 3,118 people1986

Figures cover the historical town area printed in the 1986 report. Boundaries may have changed between censuses. Legal town, environs and suburb totals remain separate and differ from modern settlement boundaries.

View population figures
Letterkenny, Donegal — Town environs only, CSO 1986 report — census population
Census yearPopulation
19812,298
19863,118

Source: CSO Census 1986, Volume 1, Table 10, page 69. Creative Commons Attribution 4.0 International (CC BY 4.0). Retrieved 2026-10-25.

Letterkenny, Donegal — Legal town, CSO 1986 report

1981–1986: legal town

6,691people · 1986

01.8K3.5K5.3K7K 1981: 6,444 people19811986: 6,691 people1986

Figures cover the historical town area printed in the 1986 report. Boundaries may have changed between censuses. Legal town, environs and suburb totals remain separate and differ from modern settlement boundaries.

View population figures
Letterkenny, Donegal — Legal town, CSO 1986 report — census population
Census yearPopulation
19816,444
19866,691

Source: CSO Census 1986, Volume 1, Table 10, page 69. Creative Commons Attribution 4.0 International (CC BY 4.0). Retrieved 2026-10-25.

Other census areas and years

These figures use different area definitions. Read the boundary note before comparing them.

Letterkenny, Donegal — 2011 legal town and environs; 2016 census settlement

Published census settlement populations

19,274people · 2016

Settlement boundaries changed during this period. Differences may reflect boundary changes as well as population change. Where a 2011 legal-town-and-environs count is shown, it has not been recalculated onto the 2016 settlement boundary.

View population figures
Letterkenny, Donegal — 2011 legal town and environs; 2016 census settlement — census population
Census yearPopulation
201119,588
201619,274

Source: CSO E2016 — Population and Actual and Percentage Change 2011 to 2016 · Supporting source 1. CC BY 4.0. Retrieved 2026-10-25.

Letterkenny, Co Donegal — Census 2022 Built Up Area

Built Up Area population, 2022

22,549people · 2022

Built Up Areas use a new land-use definition. Their population figures cannot be compared directly with Census 2016 settlement counts.

View population figures
Letterkenny, Co Donegal — Census 2022 Built Up Area — census population
Census yearPopulation
202222,549

Source: CSO F1015 — Population, Census 2022 Built Up Areas. CC BY 4.0. Retrieved 2026-10-25.

Sources & further reading

  1. Logainm.ie — Letterkenny. Place names and geographic record, licensed under CC BY 4.0.
  2. Samuel Lewis: Letterkenny (1837)
  3. Diocese of Raphoe: Cathedral of Saints Eunan and Columba
  4. Bishop Niall Coll: cathedral dedication anniversary homily (2026)
  5. Cathedral of St Eunan and St Columba, Letterkenny, County Donegal illustration: based on a Letterkenny - St Eunan's Cathedral by Colin Park. AI-assisted watercolour and ink adaptation; cream paper margins added, incidental clutter omitted and fine details simplified. Licence: CC BY-SA 2.0.

Name record retrieved 2026-10-25 · Source record modified 2025-01-10. How this page was prepared.