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 in 2000 to a total daily production of 75 m.g.d. Another important facility, the new Beetham Waste Water Treatment Plant, began to treat domestic waste to international standards in 2004. The plant serves customers within Greater Port-of Spain and environs from Pt. Cumana in the west to Mt. Hope in the east including Diego Martin and Maraval. Most solid waste is disposed of in the Beetham Landfill, commonly known as "La Basse". Port of Spain is twinned or is a sister city with the following cities: Port of Spain Port of Spain, officially the City of Port of Spain (also