The population of Brunei in 2003 was estimated by the United Nations at 358,000, which placed it as number 166 in population among the 193 nations of the world. In that year approximately 3% of the population was over 65 years of age, with another 32% of the population under 15 years of age. There were 108 males for every 100 females in the country in 2003. According to the UN, the annual population growth rate for 2000–2005 is2.27%, with the projected population for the year 2015 at 453,000. The population density in 2002 was 61 per sq km (159 per sq mi).
It was estimated by the Population Reference Bureau that 72% of the population lived in urban areas in 2001. The capital city, Bandar Seri Begawan (formerly Brunei Town), had a population of 85,000 in that year. Other important towns are Seria, Kuala Belait, and Tutong. According to the United Nations, the urban population growth rate for 2000–2005 was 2.0%.