The table below shows how the Asuriní of the Tocantins population evolved after its initial contacts with the government indigenist body.

As the above table shows, the Asuriní population remained below 100 individuals until approximately 1976-1977. This sudden growth partly resulted from the arrival in 1974 of the Asuriní who lived on the Pacajá river. After this date, continual demographic growth has been recorded, so that by 1984 children up to the age of 14 already made up approximately 55% of the population. At the time of contact (1953) the Asuriní population numbered 190 individuals. However, before the end of this year more than 50 people had died as victims of influenza and dysentery. After the epidemic, most of the Indians returned to the forest. In 1956, after a clash with the head of the FUNAI Post, the group that had stayed at the Post also retreated to the forest. Two years later, the remaining members of this group returned. At the beginning of 1962, the Pacajá group, who had first abandoned the Trocará IP, also returned to the site. At this period there were about 30 people; however, influenza and dysentery once more devastated the group: its 14 survivors fled to the forest, leaving 7 orphans at the Post.