Where in the World is St. Peter Port found? St. Peter Port is the capital of Guernsey (Bailiwick of Guernsey), situated in the Northern Europe subregion of Europe. In St. Peter Port, the currency used is Guernsey pound (£), which is the official currency used in Guernsey. The Latitude, Longitude cordinates of St. Peter Port are 49.4598, -2.5353.