Sutton is a residential suburb of Dublin's Northside, Ireland, at the base of Howth Head, the peninsula forming the northern edge of Dublin Bay. There is a small commercial core at the Sutton Cross road crossing.Location and geographyBeginning about 12 kilometres from the city centre, Sutton neighbours Howth, which occupies most of the Howth peninsula, and Baldoyle and Bayside. It is served by the main road from Dublin to Howth, the DART suburban rail system, on which it has its own station, and Dublin Bus route 31 and its variants. Historically Sutton lay entirely on the peninsula but it is now generally held to extend to the railway and perhaps as far as the junction of Baldoyle Road and the coast road, where is meets both Baldoyle and Bayside.At the coastal side of Sutton is a tombolo connecting Howth (which used to be an island) to the mainland. The original village of Sutton was situated on the city-facing (south-western) side of Howth Head, where there are today housing terraces and a small harbour, but the area is now centered on Sutton Cross, where there are two shopping areas, one anchored by Supervalu (previously Superquinn, (which replaced the local cinema), and the Marine Hotel.Sutton is part of the Dáil Éireann constituency of Dublin North-East and part of the Howth-Malahide local electoral area of Fingal County Council.