The population of Gabon in 2003 was estimated by the United Nations at 1,329,000, which placed it as number 146 in population among the 193 nations of the world. In that year approximately 6% of the population was over 65 years of age, with another 40% of the population under 15 years of age. There were 99 males for every 100 females in the country in 2003. According to the UN, the annual population growth rate for 2000–2005 is 1.79%, with the projected population for the year 2015 at 1,645,000. The population density in 2002 was 5 per sq km (12 per sq mi). Most of the people live on the coast or are concentrated along rivers and roads; large areas of the interior are sparsely inhabited.
It was estimated by the Population Reference Bureau that 81% of the population lived in urban areas in 2001. The capital city, Libreville, had a population of 523,000 in that year. Another major center is Port-Gentil, with about 164,000 inhabitants. According to the United Nations, the urban population growth rate for 2000–2005 was 3.1%.