Thurso is a town and former burgh on the north coast of the Highland council area of Scotland. It is the northernmost town on the British mainland. At the 2001 Census, Thurso had a population of about 9,000. The name comes from Old Norse Thjórsá, meaning "Bull's River".Historically, it is one of two burghs within the county of Caithness. It lies at the junction of the north-south A9 road and the west-east A836 road, connected to Bridge of Forss in the west and Castletown in the east.