The World: Population - Age 20-24 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 101. | Sierra Leone | 541,147 | 2018 | |
| 102. | Sweden | 540,427 | 2018 | |
| 103. | Central African Republic | 536,291 | 2018 | |
| 104. | Greece | 527,542 | 2018 | |
| 105. | Kyrgyzstan | 522,951 | 2018 | |
| 106. | United Arab Emirates | 514,647 | 2018 | |
| 107. | Turkmenistan | 509,990 | 2018 | |
| 108. | Republic of Congo | 495,530 | 2018 | |
| 109. | Czech Republic | 494,883 | 2018 | |
| 110. | Belarus | 494,771 | 2018 | |
| 111. | Austria | 478,701 | 2018 | |
| 112. | Switzerland | 455,372 | 2018 | |
| 113. | Serbia | 413,302 | 2018 | |
| 114. | Costa Rica | 410,661 | 2018 | |
| 115. | Liberia | 394,227 | 2018 | |
| 116. | Denmark | 375,941 | 2018 | |
| 117. | Hong Kong | 370,472 | 2018 | |
| 118. | Mauritania | 357,074 | 2018 | |
| 119. | Oman | 336,976 | 2018 | |
| 120. | Lebanon | 329,161 | 2018 | |
| 121. | Jamaica | 319,397 | 2018 | |
| 122. | Norway | 318,508 | 2018 | |
| 123. | Panama | 318,240 | 2018 | |
| 124. | Finland | 314,382 | 2018 | |
| 125. | Slovakia | 310,482 | 2018 | |
| 126. | Bulgaria | 309,127 | 2018 | |
| 127. | West Bank | 303,001 | 2018 | |
| 128. | New Zealand | 302,204 | 2018 | |
| 129. | Ireland | 293,610 | 2018 | |
| 130. | Mongolia | 288,229 | 2018 | |
| 131. | Albania | 281,351 | 2018 | |
| 132. | Croatia | 277,316 | 2018 | |
| 133. | Georgia | 270,410 | 2018 | |
| 134. | Uruguay | 269,616 | 2018 | |
| 135. | Puerto Rico | 269,348 | 2018 | |
| 136. | Bosnia and Herzegovina | 265,677 | 2018 | |
| 137. | Kuwait | 259,073 | 2018 | |
| 138. | Namibia | 255,897 | 2018 | |
| 139. | Botswana | 235,299 | 2018 | |
| 140. | Moldova | 220,264 | 2018 | |
| 141. | Armenia | 215,557 | 2018 | |
| 142. | The Gambia | 205,458 | 2018 | |
| 143. | Lithuania | 194,058 | 2018 | |
| 144. | Qatar | 192,816 | 2018 | |
| 145. | Gaza Strip | 185,576 | 2018 | |
| 146. | Lesotho | 183,337 | 2018 | |
| 147. | Guinea-Bissau | 173,512 | 2018 | |
| 148. | Gabon | 171,526 | 2018 | |
| 149. | Swaziland | 158,920 | 2018 | |
| 150. | Kosovo | 156,545 | 2018 | |
| 151. | Macedonia | 146,663 | 2018 | |
| 152. | East Timor | 124,547 | 2018 | |
| 153. | Bahrain | 124,065 | 2018 | |
| 154. | Mauritius | 100,388 | 2018 | |
| 155. | Latvia | 96,674 | 2018 | |
| 156. | Cyprus | 95,172 | 2018 | |
| 157. | Slovenia | 95,081 | 2018 | |
| 158. | Djibouti | 93,926 | 2018 | |
| 159. | Guyana | 78,147 | 2018 | |
| 160. | Fiji | 75,440 | 2018 | |
| 161. | Equatorial Guinea | 72,884 | 2018 | |
| 162. | Comoros | 72,033 | 2018 | |
| 163. | Bhutan | 71,407 | 2018 | |
| 164. | Trinidad and Tobago | 69,010 | 2018 | |
| 165. | Solomon Islands | 62,772 | 2018 | |
| 166. | Estonia | 58,433 | 2018 | |
| 167. | Western Sahara | 57,152 | 2018 | |
| 168. | Cape Verde | 56,161 | 2018 | |
| 169. | Suriname | 50,225 | 2018 | |
| 170. | Maldives | 43,565 | 2018 | |
| 171. | Brunei | 40,204 | 2018 | |
| 172. | Macau | 38,773 | 2018 | |
| 173. | Belize | 36,390 | 2018 | |
| 174. | Luxembourg | 35,403 | 2018 | |
| 175. | Montenegro | 30,399 | 2018 | |
| 176. | The Bahamas | 27,818 | 2018 | |
| 177. | Malta | 24,915 | 2018 | |
| 178. | New Caledonia | 23,143 | 2018 | |
| 179. | Iceland | 22,523 | 2018 | |
| 180. | Vanuatu | 22,397 | 2018 | |
| 181. | French Polynesia | 22,044 | 2018 | |
| 182. | Mayotte | 20,169 | 2018 | |
| 183. | Samoa | 19,094 | 2018 | |
| 184. | Sao Tome and Principe | 18,960 | 2018 | |
| 185. | Barbados | 18,489 | 2018 | |
| 186. | Guam | 16,365 | 2018 | |
| 187. | Saint Lucia | 12,935 | 2018 | |
| 188. | Netherlands Antilles | 11,307 | 2018 | |
| 189. | Kiribati | 11,190 | 2018 | |
| 190. | Tonga | 9,798 | 2018 | |
| 191. | Federated States of Micronesia | 9,381 | 2018 | |
| 192. | Grenada | 8,380 | 2018 | |
| 193. | Antigua and Barbuda | 7,970 | 2018 | |
| 194. | Saint Vincent and the Grenadines | 7,912 | 2018 | |
| 195. | Aruba | 7,851 | 2018 | |
| 196. | Channel Islands | 7,770 | 2018 | |
| 197. | American Samoa | 6,968 | 2018 | |
| 198. | Seychelles | 6,362 | 2018 | |
| 199. | Marshall Islands | 6,336 | 2018 | |
| 200. | U.S. Virgin Islands | 6,045 | 2018 |
