St. Peter Port (French: Saint-Pierre Port) is a town and one of the ten parishes on the island of Guernsey in the Channel Islands. It is the capital of the Bailiwick of Guernsey as well as the main port. The population in 2019 was 18,958. St. Peter Port is a small town (commonly referred to by locals as just "town") consisting mostly of steep narrow streets and steps on the overlooking slopes. It is known that a trading post/town existed here before Roman times with a pre-Christian name which has not survived.