Population: 4,253,877 (July 2009 est.)
Age structure: 0-14 years: 26.7% (male 581,916/female 555,216) 15-64 years: 67.1% (male 1,443,606/female 1,411,168) 65 years and over: 6.2% (male 120,969/female 141,002) (2009 est.)
Median age: total: 27.5 years male: 27.1 years female: 28 years (2009 est.)
Population growth rate: 1.356% (2009 est.)
Death rate: 4.31 deaths/1,000 population (2008 est.)
Net migration rate: 0.47 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: 1.02 male(s)/female 65 years and over: 0.86 male(s)/female total population: 1.02 male(s)/female (2009 est.)
Infant mortality rate: total: 8.77 deaths/1,000 live births male: 9.66 deaths/1,000 live births female: 7.83 deaths/1,000 live births (2009 est.)
Life expectancy at birth: total population: 77.58 years male: 74.96 years female: 80.34 years (2009 est.)
Total fertility rate: 2.14 children born/woman (2009 est.)
HIV/AIDS - adult prevalence rate: 0.4% (2007 est.)
HIV/AIDS - people living with HIV/AIDS: 9,700 (2007 est.)
HIV/AIDS - deaths: fewer than 200 (2007 est.)
Nationality: noun: Costa Rican(s) adjective: Costa Rican
Ethnic groups: white (including mestizo) 94%, black 3%, Amerindian 1%, Chinese 1%, other 1%
Religions: Roman Catholic 76.3%, Evangelical 13.7%, Jehovah's Witnesses 1.3%, other Protestant 0.7%, other 4.8%, none 3.2%
Languages: Spanish (official), English
Literacy: definition: age 15 and over can read and write total population: 94.9% male: 94.7% female: 95.1% (2000 census)