The World: Population - Age 20-24 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 101. | Singapore | 555,465 | 2021 | |
| 102. | United Arab Emirates | 542,736 | 2021 | |
| 103. | Republic of Congo | 541,420 | 2021 | |
| 104. | Greece | 525,459 | 2021 | |
| 105. | Hungary | 508,479 | 2021 | |
| 106. | Kyrgyzstan | 490,384 | 2021 | |
| 107. | Sweden | 488,195 | 2021 | |
| 108. | Liberia | 480,092 | 2021 | |
| 109. | Czech Republic | 459,634 | 2021 | |
| 110. | Turkmenistan | 459,017 | 2021 | |
| 111. | Belarus | 456,243 | 2021 | |
| 112. | Austria | 441,099 | 2021 | |
| 113. | Switzerland | 437,417 | 2021 | |
| 114. | Costa Rica | 398,602 | 2021 | |
| 115. | Serbia | 380,038 | 2021 | |
| 116. | Mauritania | 379,105 | 2021 | |
| 117. | Denmark | 367,443 | 2021 | |
| 118. | Oman | 332,457 | 2021 | |
| 119. | Panama | 326,098 | 2021 | |
| 120. | Norway | 313,036 | 2021 | |
| 121. | Hong Kong | 309,881 | 2021 | |
| 122. | Ireland | 308,777 | 2021 | |
| 123. | West Bank | 307,907 | 2021 | |
| 124. | Lebanon | 305,591 | 2021 | |
| 125. | Jamaica | 305,450 | 2021 | |
| 126. | New Zealand | 300,277 | 2021 | |
| 127. | Bulgaria | 299,461 | 2021 | |
| 128. | Finland | 294,742 | 2021 | |
| 129. | Slovakia | 284,766 | 2021 | |
| 130. | Mongolia | 276,529 | 2021 | |
| 131. | Uruguay | 262,195 | 2021 | |
| 132. | Kuwait | 260,495 | 2021 | |
| 133. | Namibia | 256,001 | 2021 | |
| 134. | Puerto Rico | 255,576 | 2021 | |
| 135. | Bosnia and Herzegovina | 250,611 | 2021 | |
| 136. | Croatia | 250,018 | 2021 | |
| 137. | Albania | 248,321 | 2021 | |
| 138. | Georgia | 238,760 | 2021 | |
| 139. | Botswana | 238,280 | 2021 | |
| 140. | The Gambia | 211,798 | 2021 | |
| 141. | Gaza Strip | 201,254 | 2021 | |
| 142. | Qatar | 189,780 | 2021 | |
| 143. | Moldova | 185,238 | 2021 | |
| 144. | Gabon | 184,440 | 2021 | |
| 145. | Lesotho | 183,965 | 2021 | |
| 146. | Guinea-Bissau | 183,504 | 2021 | |
| 147. | Armenia | 176,947 | 2021 | |
| 148. | Lithuania | 172,715 | 2021 | |
| 149. | Kosovo | 165,362 | 2021 | |
| 150. | Swaziland | 163,219 | 2021 | |
| 151. | Macedonia | 138,570 | 2021 | |
| 152. | Bahrain | 127,438 | 2021 | |
| 153. | East Timor | 126,162 | 2021 | |
| 154. | Mauritius | 97,305 | 2021 | |
| 155. | Djibouti | 97,303 | 2021 | |
| 156. | Slovenia | 90,442 | 2021 | |
| 157. | Latvia | 87,388 | 2021 | |
| 158. | Cyprus | 85,459 | 2021 | |
| 159. | Guyana | 82,405 | 2021 | |
| 160. | Comoros | 80,814 | 2021 | |
| 161. | Equatorial Guinea | 79,643 | 2021 | |
| 162. | Fiji | 70,058 | 2021 | |
| 163. | Bhutan | 70,001 | 2021 | |
| 164. | Solomon Islands | 66,374 | 2021 | |
| 165. | Trinidad and Tobago | 66,178 | 2021 | |
| 166. | Western Sahara | 61,523 | 2021 | |
| 167. | Estonia | 55,334 | 2021 | |
| 168. | Suriname | 54,291 | 2021 | |
| 169. | Cape Verde | 53,950 | 2021 | |
| 170. | Brunei | 40,031 | 2021 | |
| 171. | Belize | 37,510 | 2021 | |
| 172. | Maldives | 35,942 | 2021 | |
| 173. | Luxembourg | 35,874 | 2021 | |
| 174. | Macau | 31,389 | 2021 | |
| 175. | Montenegro | 29,054 | 2021 | |
| 176. | The Bahamas | 26,623 | 2021 | |
| 177. | New Caledonia | 23,527 | 2021 | |
| 178. | Mayotte | 23,335 | 2021 | |
| 179. | Malta | 23,268 | 2021 | |
| 180. | Vanuatu | 21,953 | 2021 | |
| 181. | Iceland | 21,942 | 2021 | |
| 182. | French Polynesia | 21,648 | 2021 | |
| 183. | Sao Tome and Principe | 21,187 | 2021 | |
| 184. | Samoa | 19,074 | 2021 | |
| 185. | Barbados | 18,190 | 2021 | |
| 186. | Guam | 17,106 | 2021 | |
| 187. | Kiribati | 11,711 | 2021 | |
| 188. | Saint Lucia | 11,335 | 2021 | |
| 189. | Netherlands Antilles | 9,925 | 2021 | |
| 190. | Tonga | 9,832 | 2021 | |
| 191. | Federated States of Micronesia | 8,932 | 2021 | |
| 192. | Antigua and Barbuda | 8,265 | 2021 | |
| 193. | Grenada | 7,529 | 2021 | |
| 194. | Aruba | 7,439 | 2021 | |
| 195. | Saint Vincent and the Grenadines | 7,410 | 2021 | |
| 196. | Marshall Islands | 7,242 | 2021 | |
| 197. | Channel Islands | 7,209 | 2021 | |
| 198. | American Samoa | 6,494 | 2021 | |
| 199. | Seychelles | 5,886 | 2021 | |
| 200. | U.S. Virgin Islands | 5,549 | 2021 |
