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
Dublin, New Hampshire slopes of Mount Monadnock occupy the southern part of town. The highest point in Dublin is along Monadnock's northeast ridge, where the elevation reaches above sea level at the town line. Roughly the western half of Dublin lies within the Connecticut River watershed, drained by tributaries of the Ashuelot River, with the eastern half located in the Merrimack River watershed, drained by tributaries of the Contoocook River. The town is crossed by New Hampshire Route 101 and New Hampshire Route 137. At the 2000 census, there were 1,476 people, 560 households and 417 families residing in the town. The population