Guess the Countries by Unknown Category #3

Top twenty countries. One secret category. Can you figure it out?
Quiz by Quizzer6794
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Last updated: July 21, 2016
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First submittedJuly 21, 2016
Times taken1,444
Average score61.9%
Rating4.75
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UNKNOWN CATEGORY:
 
 
Population
Country
2,250,000*
China
2,217,000
United States
644,696
Russia
607,731
Brazil
418,536
India
311,036
Thailand
255,138
Mexico
225,624
Iran
175,000*
North Korea
165,033
Turkey
Countries with the Most Prisoners
 
 
Population
Country
161,692
Indonesia
159,241
South Africa
142,636
Vietnam
121,389
Colombia
120,076
Philippines
111,050
Ethiopia
96,203
United Kingdom
80,169
Pakistan
76,000
Morocco
75,379
Peru
+1
Level 82
Jul 21, 2016
Great series of quizzes :)
+2
Level 80
Mar 25, 2020
Where's Australias 23 Million :p
+1
Level 56
Jun 11, 2022
rip 19/21
+1
Level 88
Jun 17, 2022
Oof. I had almost all the countries but wasn't able to guess the category. Seems obvious in retrospect. Good one.