Dundalk is the county town of County Louth, Ireland. The town is on the Castletown River, which flows into Dundalk Bay on the east coast of Ireland. It is halfway between Dublin and Belfast, close to the border with Northern Ireland. It is surrounded by several townlands and villages that form the wider Dundalk Municipal District. It is the seventh largest urban area in Ireland, with a population of 43,112 as of the 2022 census.