Prison Population Rankings ...
1 United States of America 2 228 424
2 China 1 701 344
3 Russian Federation 672 100
4 Brazil 581 507
5 India 411 992
6 Thailand 318 841
7 Mexico 254 641
8 Iran 217 851
9 Indonesia 167 163
10 South Africa 157 394
http://www.prisonstudies.org/highest-to-lowest/prison-population-total