Letterkenny's 2026 population is now estimated at 25,036.In 2016, the population of Letterkenny was 19,274.Letterkenny has grown by 646 in the last year, which represents a 2.65% annual change.These population values and projections come from CSO SAP2016T1T1SET settlement population (Census 2016), CSO SAP2022T1T1TOWN22 town population (Census 2022) and World Population Review Internal Projections.
City | 2026 Pop.↓ | Growth |
|---|---|---|
| Dublin | 1,327,053 | 1.24% |
| Cork | 232,271 | 1.08% |
| Limerick | 108,067 | 1.38% |
| Galway | 90,140 | 1.21% |
| Waterford | 64,905 | 1.95% |
| Drogheda | 46,390 | 1.25% |
| Dundalk | 46,088 | 1.68% |
| Swords | 41,828 | 0.64% |
| Bray | 34,134 | 0.46% |
| Naas | 29,952 | 3.42% |
| Ennis | 29,840 | 1.67% |
| Carlow | 29,618 | 2.01% |
| Tralee | 27,803 | 1.61% |
| Kilkenny | 27,641 | 0.42% |
| Balbriggan | 26,226 | 1.9% |
| Greystones-Delgany | 25,036 | 3.27% |
| Letterkenny | 25,036 | 2.65% |
| Athlone | 23,942 | 1.15% |
| Mullingar | 23,906 | 1.34% |
| Wexford | 22,463 | 1.07% |
