Population: 154,878 (July 1999 est.)

Age structure:
0-14 years: 48% (male 37,322; female 36,423)
15-64 years: 48% (male 36,067; female 38,730)
65 years and over: 4% (male 2,876; female 3,460) (1999 est.)

Population growth rate: 3.14% (1999 est.)

Birth rate: 43.31 births/1,000 population (1999 est.)

Death rate: 8.08 deaths/1,000 population (1999 est.)

Net migration rate: -3.88 migrant(s)/1,000 population (1999 est.)

Sex ratio:
at birth: 1.03 male(s)/female
under 15 years: 1.02 male(s)/female
15-64 years: 0.93 male(s)/female
65 years and over: 0.83 male(s)/female
total population: 0.97 male(s)/female (1999 est.)

Infant mortality rate: 52.93 deaths/1,000 live births (1999 est.)

Life expectancy at birth:
total population: 64.71 years
male: 63.18 years
female: 66.28 years (1999 est.)

Total fertility rate: 6.14 children born/woman (1999 est.)

Nationality:
noun: Sao Tomean(s)
adjective: Sao Tomean

Ethnic groups: mestico, angolares (descendants of Angolan slaves), forros (descendants of freed slaves), servicais (contract laborers from Angola, Mozambique, and Cape Verde), tongas (children of servicais born on the islands), Europeans (primarily Portuguese)

Religions: Roman Catholic, Evangelical Protestant, Seventh-Day Adventist

Languages: Portuguese (official)

Literacy:
definition: age 15 and over can read and write
total population: 73%
male: 85%
female: 62% (1991 est.)