In 2015, the world's population was 7.3 billion people.
China led the world in population in 2015, with 1,393,715,448 people, which includes 410 million families. China's population grew from 540 million in 1949 to 969 million in 1979. The one-child policy was instituted in 1979, which slowed China's growth.
India's population in 2015 stood at 1,322,866,505, an increase from the previous year. Together, India and China made up a third of the entire world's population in 2015.
In 2015, the United States population was 320.88 million people, which accounted for 4.5% of the world's population. The US Census Bureau reported an increase of 0.73% from 2014.
Indonesia reported a population of 259,091,970 people in 2015. Most of Indonesia's residents live on the Island of Java, the most populated island in the world.
Brazil accounted for 2.83% of the world's population in 2015, with 205,188,205 people. The annual population growth rate for Brazil in 2015 was 1.20%.
The estimated population of Pakistan in 2015 was 191.71 million, which was the highest increase in Pakistan's population ever recorded.
Nigeria's population in 2015 was 183,995,785, which makes it the most populated country in Africa. The United Nations predicts that the population of Nigeria will reach 550 million people by 2100.
The population in Bangladesh was 157,830,000. The population growth rate of Bangladesh in 2015 was 2.14%. Dhaka was the most populated region in Indonesia in 2015, with 8.5 million residents.
Russia's population in 2015 was 146,544,710 people, an increase of 277,422 from the previous year. The UN estimates that the Russian population will decrease by 136 million in 2050.
Mexico was the tenth most populated country in the world, with 119.53 million people. The UN estimates that the population of Mexico will reach 145 million people by 2050.