Many ethnic groups and cultures are represented in Delhi, making it a cosmopolitan city. Being the political and economic hub of northern India, the city attracts workers – both blue collar and white collar – from all parts of India, further enhancing its diverse character. A diplomatic hub, home to the embassies of 160 countries, Delhi has a large expatriate population as well.
According to the 2011 census of India, the population of Delhi is 16,753,235. The corresponding population density was 11,297 persons per km2, with a sex ratio of 866 women per 1000 men, and a literacy rate of 86.34%. In 2004, the birth rate, death rate and infant mortality rate (per 1000 population) were 20.03, 5.59 and 13.08, respectively. According a 1999–2000 estimate, the total number of people living below the poverty line, defined as living on $11 or less per month, in Delhi was 1,149,000 (which was 8.23% of the total population, compared to 27.5% of India as a whole). In 2001, the population of Delhi increased by 285,000 as a result of migration and by an additional 215,000 as a result of natural population growth – this made Delhi one of the fastest growing cities in the world. By 2015, Delhi is expected to be the third-largest agglomeration in the world after Tokyo and Mumbai. Dwarka, Asia's largest planned residential colony, is located within the National Capital Territory of Delhi.