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 natural gas and oil. No heavy industrial sites are located in Port of Spain, but a major oil refinery and many petrochemical and iron and steel plants exist or are planned for sites south of it and closer to Trinidad's second city of San Fernando. However, the oil and gas majors and some service companies have located their headquarters in the city to be in close proximity to government services, infrastructure and the high quality of life many citizens of Port of Spain enjoy. Some of the oil and gas company headquarters located in Port of Spain (many others are