The U.S. ranks 1st in prisoners

According to the International Centre for Prison Studies, there are 2,228,424 prisoners in the United States. That is enough to make the United States rank first in that category. The second highest number of prisoners is in China, at 1,701,344.

Chart from ICPS
http://www.prisonstudies.org/highest-to-lowest/prison-population-total?field_region_taxonomy_tid=All