Port of Spain is the name of an island.
Port of Spain is the capital city of the Republic of Trinidad and Tobago and the country 's third-largest municipality , after Chaguanas and San Fernando . It is located on the Gulf of Paria , on the northwest coast of the island of Trinidad and is part of a larger conurbation stretching from Chaguaramas in the west to Arima in the east with an estimated population of 600,000 . The city serves primarily as a retail and administrative centre and it has been the capital of the island since 1757 . The city is also home to the largest container port on the island and is one of several shipping hubs of the Caribbean , exporting both agricultural products and manufactured goods .