Port of Spain is a large human settlement.
A city is a large and permanent human settlement . 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 . The city has a municipal population of 37,074 ( 2011 census ) , a metropolitan population of 128,026 ( 1990 unofficial estimate ) and a transient daily population of 250,000 . 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 .