South Dublin

South Dublin
Átha Cliath Theas
County
Mottoes: 
  • This We Hold in Trust
  • Irish: Ag Seo Ár gCúram
Inset showing South Dublin (darkest green in inset) within Dublin Region (lighter green)
CountryIreland
ProvinceLeinster
RegionEastern and Midland
Established1994
County townTallaght
Government
  Local authoritySouth Dublin County Council
  Dáil constituencies
  EU ParliamentDublin
Area
  Total
222.74 km2 (86.00 sq mi)
Highest elevation757 m (2,484 ft)
Population
 (2022)
  Total
301,075
  Density1,400/km2 (3,500/sq mi)
Time zoneUTC±0 (WET)
  Summer (DST)UTC+1 (IST)
Vehicle index
mark code
D
WebsiteOfficial website

South Dublin (Irish: Átha Cliath Theas) is a county in Ireland, within the province of Leinster and the Eastern and Midland Region. It is one of three successor counties to County Dublin, which was disestablished for administrative purposes in 1994. South Dublin County Council is the local authority for the county. The county contains both dense suburbs of Dublin and stretches of unpopulated mountains. In 2022 it had a population of 301,705, making it the fourth most populous county in the state.