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Key Takeaways:

India is projected to remain the world’s most populous country in 2054, reaching 1.69 billion, an increase of 246 million from 2024.
China’s population is expected to decline to 1.22 billion by 2054, marking a 14.1% decrease.
Nigeria is projected to rise to 5th place globally, with a population of 374 million, a 62% increase from 2024.
The United States remains the only high-income country in the top five, with a projected population of 384 million.
Pakistan is expected to climb from 5th to 3rd place, adding 138 million people by 2054.
Three African countries (Nigeria, Ethiopia, and the Democratic Republic of the Congo) are expected to rank among the top 10 most populous nations.
Russia is projected to see a population decline of 6.9%.

Key Takeaways:

India is projected to remain the world’s most populous country in 2100, with 1.5 billion people, a 4.5% increase from 2024.
China’s population is expected to fall sharply by 55.1% to 638.7 million, less than half of its 2024 population.
Pakistan's population is expected to nearly double by 2100.
Nigeria is projected to become the world’s fourth most populous country by 2100, with a population of more than 470 million.
Seven of the 15 most populous countries in 2100 are expected to be in Africa.
The United States is projected to rank sixth globally by 2100 from its current third position, despite a 22.2% expected population increase from 2024.
Together, the top 15 countries are expected to account for 57.9% of the global population by 2100.
The total world population is projected to reach 10.19 billion by the end of the century.