South Dublin South Dublin South Dublin () is a county in Ireland, within the province of Leinster, and the Dublin Region, a successor to County Dublin, from which its name derives. South Dublin County Council is the local authority for the county. The county contains both dense suburbs of Dublin and stretches of unpopulated mountain. In 2011 it had a population of 278,749, making it the third most populous county in the state. South Dublin has an area of 222.74 square kilometres. It is bounded by Dublin City (15 km to the north east), the River Liffey (separating it from Fingal to
Transport in Dublin Dún Laoghaire harbour from both Malahide and Howth in the north which en route to Dún Laoghaire goes straight the city centre. It is also served from Greystones in the south. Both domestic and international air traffic in Dublin is served by Dublin Airport which is located 10 km north of Dublin city centre in Collinstown and is accessible by car or bus. It is the busiest airport by far in Ireland with 27.9 million passengers in 2016, making it the 15th busiest airport in Europe with flights to other airports in Ireland, Europe, North America, Africa and the Middle