Port of Spain had a local campus enrollment of 15,571 in academic year 2007/2008. The University of Trinidad and Tobago has several campuses and institutes in the greater Port of Spain area including the research based Natural Gas Institute of the Americas and the Chaguaramas Centre for Maritime Studies. Port of Spain has a population of 18,008 males and 19,066 females, with 5,694 businesses and is home to 12,333 households with an average size of 2.9 according to the 2011 census. The city experienced an average annual growth rate of −2.3% between the censuses of 2000 and 2011 Port of Spain's diverse population
Port of Spain town's population and its geographical extension westwards. From the small cluster of buildings at the foot of the Laventille Hills, eleven streets were laid out west to the area bounded by the St. Ann's River, thus establishing the grid pattern which has survived in downtown Port of Spain to the present day. Along the sea shore was the Plaza de la Marina (Marine Square), a parade ground. By 1786, the town had a population of about 3,000. Realising that the St. Ann's River, prone to flooding, was impeding the expansion of the town, Chacón had its course diverted in 1787