Population: 3,971,020 (July 2009 est.)
Age structure: 0-14 years: 19.9% (male 404,635/female 386,733) 15-64 years: 66% (male 1,260,114/female 1,361,193) 65 years and over: 14.1% (male 240,318/female 318,027) (2009 est.)
Median age: total: 36.2 years male: 34.5 years female: 37.9 years (2009 est.)
Population growth rate: 0.34% (2009 est.)
Death rate: 7.88 deaths/1,000 population (2008 est.)
Net migration rate: -0.96 migrant(s)/1,000 population (2009 est.)
Sex ratio: at birth: 1.05 male(s)/female under 15 years: 1.05 male(s)/female 15-64 years: 0.93 male(s)/female 65 years and over: 0.76 male(s)/female total population: 0.92 male(s)/female (2009 est.)
Infant mortality rate: total: 8.42 deaths/1,000 live births male: 9.69 deaths/1,000 live births female: 7.1 deaths/1,000 live births (2009 est.)
Life expectancy at birth: total population: 78.53 years male: 74.85 years female: 82.39 years (2009 est.)
Total fertility rate: 1.71 children born/woman (2009 est.)
HIV/AIDS - adult prevalence rate: NA
HIV/AIDS - people living with HIV/AIDS: 7,397 (1997)
HIV/AIDS - deaths: NA
Nationality: noun: Puerto Rican(s) (US citizens) adjective: Puerto Rican
Ethnic groups: white (mostly Spanish origin) 76.2%, black 6.9%, Asian 0.3%, Amerindian 0.2%, mixed 4.4%, other 12% (2007)
Religions: Roman Catholic 85%, Protestant and other 15%
Languages: Spanish, English
Literacy: definition: age 15 and over can read and write total population: 94.1% male: 93.9% female: 94.4% (2002 est.)