The World: Population - Age 20-24 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 65. | Zimbabwe | 1,515,911 | 2018 | |
| 62. | Zambia | 1,568,106 | 2018 | |
| 40. | Yemen | 2,824,722 | 2018 | |
| 167. | Western Sahara | 57,152 | 2018 | |
| 127. | West Bank | 303,001 | 2018 | |
| 220. | Wallis and Futuna | 1,204 | 2018 | |
| 13. | Vietnam | 7,936,976 | 2018 | |
| 42. | Venezuela | 2,739,512 | 2018 | |
| 180. | Vanuatu | 22,397 | 2018 | |
| 39. | Uzbekistan | 2,878,175 | 2018 | |
| 134. | Uruguay | 269,616 | 2018 | |
| 4. | United States of America | 21,447,494 | 2018 | |
| 28. | United Kingdom | 4,058,128 | 2018 | |
| 106. | United Arab Emirates | 514,647 | 2018 | |
| 49. | Ukraine | 2,312,387 | 2018 | |
| 27. | Uganda | 4,158,131 | 2018 | |
| 200. | U.S. Virgin Islands | 6,045 | 2018 | |
| 222. | Tuvalu | 1,086 | 2018 | |
| 206. | Turks and Caicos Islands | 3,836 | 2018 | |
| 107. | Turkmenistan | 509,990 | 2018 | |
| 15. | Turkey | 6,848,319 | 2018 | |
| 83. | Tunisia | 829,576 | 2018 | |
| 164. | Trinidad and Tobago | 69,010 | 2018 | |
| 190. | Tonga | 9,798 | 2018 | |
| 86. | Togo | 732,407 | 2018 | |
| 142. | The Gambia | 205,458 | 2018 | |
| 176. | The Bahamas | 27,818 | 2018 | |
| 20. | Thailand | 5,085,845 | 2018 | |
| 21. | Tanzania | 5,062,319 | 2018 | |
| 85. | Tajikistan | 769,826 | 2018 | |
| 61. | Taiwan | 1,573,081 | 2018 | |
| 50. | Syria | 2,278,806 | 2018 | |
| 112. | Switzerland | 455,372 | 2018 | |
| 102. | Sweden | 540,427 | 2018 | |
| 149. | Swaziland | 158,920 | 2018 | |
| 169. | Suriname | 50,225 | 2018 | |
| 19. | Sudan | 5,128,805 | 2018 | |
| 60. | Sri Lanka | 1,608,886 | 2018 | |
| 48. | Spain | 2,356,115 | 2018 | |
| 32. | South Korea | 3,365,570 | 2018 | |
| 23. | South Africa | 4,680,902 | 2018 | |
| 81. | Somalia | 959,546 | 2018 | |
| 165. | Solomon Islands | 62,772 | 2018 | |
| 157. | Slovenia | 95,081 | 2018 | |
| 125. | Slovakia | 310,482 | 2018 | |
| 211. | Sint Maarten | 3,243 | 2018 | |
| 99. | Singapore | 576,661 | 2018 | |
| 101. | Sierra Leone | 541,147 | 2018 | |
| 198. | Seychelles | 6,362 | 2018 | |
| 113. | Serbia | 413,302 | 2018 | |
| 68. | Senegal | 1,418,981 | 2018 | |
| 41. | Saudi Arabia | 2,794,979 | 2018 | |
| 184. | Sao Tome and Principe | 18,960 | 2018 | |
| 216. | San Marino | 1,928 | 2018 | |
| 183. | Samoa | 19,094 | 2018 | |
| 194. | Saint Vincent and the Grenadines | 7,912 | 2018 | |
| 228. | Saint Pierre and Miquelon | 213 | 2018 | |
| 218. | Saint Martin | 1,713 | 2018 | |
| 187. | Saint Lucia | 12,935 | 2018 | |
| 209. | Saint Kitts and Nevis | 3,731 | 2018 | |
| 225. | Saint Helena | 480 | 2018 | |
| 227. | Saint Barthélemy | 311 | 2018 | |
| 73. | Rwanda | 1,163,275 | 2018 | |
| 17. | Russia | 6,575,167 | 2018 | |
| 75. | Romania | 1,147,811 | 2018 | |
| 108. | Republic of Congo | 495,530 | 2018 | |
| 144. | Qatar | 192,816 | 2018 | |
| 135. | Puerto Rico | 269,348 | 2018 | |
| 96. | Portugal | 610,883 | 2018 | |
| 53. | Poland | 2,119,105 | 2018 | |
| 9. | Philippines | 10,392,007 | 2018 | |
| 37. | Peru | 2,902,969 | 2018 | |
| 89. | Paraguay | 699,049 | 2018 | |
| 91. | Papua New Guinea | 667,397 | 2018 | |
| 123. | Panama | 318,240 | 2018 | |
| 217. | Palau | 1,818 | 2018 | |
| 5. | Pakistan | 21,406,384 | 2018 | |
| 119. | Oman | 336,976 | 2018 | |
| 122. | Norway | 318,508 | 2018 | |
| 212. | Northern Mariana Islands | 2,916 | 2018 | |
| 55. | North Korea | 2,004,938 | 2018 | |
| 6. | Nigeria | 17,726,668 | 2018 | |
| 57. | Niger | 1,839,813 | 2018 | |
| 92. | Nicaragua | 646,469 | 2018 | |
| 128. | New Zealand | 302,204 | 2018 | |
| 178. | New Caledonia | 23,143 | 2018 | |
| 188. | Netherlands Antilles | 11,307 | 2018 | |
| 79. | Netherlands | 1,036,140 | 2018 | |
| 31. | Nepal | 3,644,525 | 2018 | |
| 223. | Nauru | 756 | 2018 | |
| 138. | Namibia | 255,897 | 2018 | |
| 22. | Myanmar | 5,038,158 | 2018 | |
| 43. | Mozambique | 2,726,686 | 2018 | |
| 38. | Morocco | 2,880,359 | 2018 | |
| 226. | Montserrat | 344 | 2018 | |
| 175. | Montenegro | 30,399 | 2018 | |
| 130. | Mongolia | 288,229 | 2018 | |
| 219. | Monaco | 1,457 | 2018 | |
| 140. | Moldova | 220,264 | 2018 | |
| 10. | Mexico | 10,306,384 | 2018 |
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