According to the United Nation’s report, Delhi is the second most populous city with 25 million population. Tokyo continues to be the most populous city with 38 million.

Delhi has almost doubled its population during the last 25 years, since 1990. Mumbai is in the 4th position with 21 million along with Mexico and Sauo Paulo.

The combined population of China,India, US, Brazil, Indonesia, Japan and Russia is more than half of the world population of 7.1 billion.

July 11th is the world population Day.