The table compares the population of the world's top ten countries in 2019 with projected numbers in 2100.

In 2019, China had the highest population of 1,439 million, with India second on 1,380 million. However, by 2100, India is projected to have the highest population of 1,551 million with China second on 941 million - down 498 million since 2019. Although the USA is projected to increase its population from 331 million to 478 million, it steps down from third to fourth place, being overtaken by Nigeria, which moves up from seventh place with 206 million to a total of 730 million, representing a massive increase of 524 million. Brazil drops from sixth place in 2019 with 213 million, down to tenth in 2100 on 177 million - a decrease of 36 million.

Three of the ten most populous countries in the world will no longer be among the top ten in 2100, and all three will be supplanted by rapidly growing nations in Africa.

Except for China and Brazil, all other projections show an increase between 2019 and 2100, but there is a significant shuffling of position by some countries, the elimination of others, and the introduction of new contenders for a top-ten placing.

该表比较了2019年世界十大国家的人口与2100年的预测数字。

2019年，中国人口最多，为14.39亿，印度第二，为13.80亿。然而，到2100年，印度的人口预计最高，为15.51亿，中国第二，为9.41亿--比2019年减少了4.98亿。虽然美国的人口预计将从3.31亿增加到4.78亿，但它从第三位退居第四位，被尼日利亚超越，后者从第七位的2.06亿上升到总人口7.3亿，大幅增加了5.24亿。巴西从2019年的第六位2.13亿，下降到2100年的第十位1.77亿，减少了3600万。

2100年，世界上人口最多的十个国家中，有三个国家将不再是前十名，这三个国家都将被非洲快速增长的国家所取代。

除中国和巴西外，其他所有预测都显示2019年至2100年之间会有所增长，但一些国家的位置会有明显的洗牌，另一些国家则会被淘汰，并引入新的前十名竞争者。