Population: 5,296,651 (July 1999 est.)

Age structure:
0-14 years: 45% (male 1,182,181; female 1,219,956)
15-64 years: 52% (male 1,307,475; female 1,423,046)
65 years and over: 3% (male 82,374; female 81,619) (1999 est.)

Population growth rate: 4.34% (1999 est.)

Birth rate: 45.62 births/1,000 population (1999 est.)

Death rate: 16.77 deaths/1,000 population (1999 est.)

Net migration rate: 14.5 migrant(s)/1,000 population (1999 est.)

Sex ratio:
at birth: 1.03 male(s)/female
under 15 years: 0.97 male(s)/female
15-64 years: 0.92 male(s)/female
65 years and over: 1.01 male(s)/female
total population: 0.94 male(s)/female (1999 est.)

Infant mortality rate: 126.23 deaths/1,000 live births (1999 est.)

Life expectancy at birth:
total population: 49.13 years
male: 46.07 years
female: 52.27 years (1999 est.)

Total fertility rate: 6.16 children born/woman (1999 est.)

Nationality:
noun: Sierra Leonean(s)
adjective: Sierra Leonean

Ethnic groups: 20 native African tribes 90% (Temne 30%, Mende 30%, other 30%), Creole 10% (descendents of freed Jamaican slaves who were settled in the Freetown area in the late-eighteenth century), refugees from Liberia's recent civil war, small numbers of Europeans, Lebanese, Pakistanis, and Indians

Religions: Muslim 60%, indigenous beliefs 30%, Christian 10%

Languages: English (official, regular use limited to literate minority), Mende (principal vernacular in the south), Temne (principal vernacular in the north), Krio (English-based Creole, spoken by the descendents of freed Jamaican slaves who were settled in the Freetown area, a lingua franca and a first language for 10% of the population but understood by 95%)

Literacy:
definition: age 15 and over can read and write English, Mende, Temne, or Arabic
total population: 31.4%
male: 45.4%
female: 18.2% (1995 est.)