The population of Paraguay in 2003 was estimated by the United Nations at 5,878,000, which placed it as number 100 in population among the 193 nations of the world. In that year approximately 5% of the population was over 65 years of age, with another 39% of the population under 15 years of age. There were 102 males for every 100 females in the country in 2003. According to the UN, the annual population growth rate for 2000–2005 is 2.37%, with the projected population for the year 2015 at 7,653,000. The population density in 2002 was 15 per sq km (38 per sq mi). Over 98% of the population is located in the eastern two-fifths of the country; the vast western Chaco region is virtually uninhabited.
It was estimated by the Population Reference Bureau that 56% of the population lived in urban areas in 2001. The capital city, Asunción, had a population of 1,224,000 in that year. Other leading cities include Ciudad del Este, 98,591; Pedro Juan Caballero, 41,475; Encarnación, 31,445; Pilar, 26,352; and Concepción, 25,607. According to the United Nations, the urban population growth rate for 2000–2005 was 3.6%.