The World: Population - Age 0-4 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 56. | Zimbabwe | 2,278,138 | 2021 | |
| 41. | Zambia | 3,218,077 | 2021 | |
| 36. | Yemen | 3,684,258 | 2021 | |
| 159. | Western Sahara | 85,616 | 2021 | |
| 118. | West Bank | 320,828 | 2021 | |
| 221. | Wallis and Futuna | 1,033 | 2021 | |
| 16. | Vietnam | 7,152,605 | 2021 | |
| 49. | Venezuela | 2,774,634 | 2021 | |
| 179. | Vanuatu | 22,041 | 2021 | |
| 54. | Uzbekistan | 2,422,225 | 2021 | |
| 138. | Uruguay | 216,313 | 2021 | |
| 4. | United States of America | 22,506,398 | 2021 | |
| 31. | United Kingdom | 3,897,909 | 2021 | |
| 103. | United Arab Emirates | 509,942 | 2021 | |
| 64. | Ukraine | 1,860,650 | 2021 | |
| 14. | Uganda | 9,713,373 | 2021 | |
| 200. | U.S. Virgin Islands | 5,814 | 2021 | |
| 219. | Tuvalu | 1,248 | 2021 | |
| 205. | Turks and Caicos Islands | 3,993 | 2021 | |
| 105. | Turkmenistan | 490,298 | 2021 | |
| 18. | Turkey | 6,509,179 | 2021 | |
| 89. | Tunisia | 863,636 | 2021 | |
| 163. | Trinidad and Tobago | 70,061 | 2021 | |
| 188. | Tonga | 10,797 | 2021 | |
| 75. | Togo | 1,284,561 | 2021 | |
| 129. | The Gambia | 269,518 | 2021 | |
| 177. | The Bahamas | 24,774 | 2021 | |
| 30. | Thailand | 4,084,857 | 2021 | |
| 20. | Tanzania | 6,051,257 | 2021 | |
| 84. | Tajikistan | 939,905 | 2021 | |
| 82. | Taiwan | 964,233 | 2021 | |
| 53. | Syria | 2,430,330 | 2021 | |
| 114. | Switzerland | 366,666 | 2021 | |
| 104. | Sweden | 497,771 | 2021 | |
| 147. | Swaziland | 165,982 | 2021 | |
| 169. | Suriname | 45,053 | 2021 | |
| 15. | Sudan | 8,259,286 | 2021 | |
| 71. | Sri Lanka | 1,644,516 | 2021 | |
| 58. | Spain | 2,256,434 | 2021 | |
| 61. | South Korea | 2,002,161 | 2021 | |
| 28. | South Africa | 4,241,018 | 2021 | |
| 62. | Somalia | 1,949,746 | 2021 | |
| 161. | Solomon Islands | 77,727 | 2021 | |
| 162. | Slovenia | 77,679 | 2021 | |
| 135. | Slovakia | 257,749 | 2021 | |
| 212. | Sint Maarten | 2,783 | 2021 | |
| 126. | Singapore | 280,120 | 2021 | |
| 79. | Sierra Leone | 1,052,682 | 2021 | |
| 199. | Seychelles | 6,023 | 2021 | |
| 119. | Serbia | 311,291 | 2021 | |
| 55. | Senegal | 2,326,002 | 2021 | |
| 52. | Saudi Arabia | 2,627,309 | 2021 | |
| 175. | Sao Tome and Principe | 28,785 | 2021 | |
| 217. | San Marino | 1,561 | 2021 | |
| 184. | Samoa | 19,447 | 2021 | |
| 197. | Saint Vincent and the Grenadines | 6,365 | 2021 | |
| 228. | Saint Pierre and Miquelon | 196 | 2021 | |
| 213. | Saint Martin | 2,617 | 2021 | |
| 189. | Saint Lucia | 10,300 | 2021 | |
| 209. | Saint Kitts and Nevis | 3,460 | 2021 | |
| 225. | Saint Helena | 365 | 2021 | |
| 226. | Saint Barthélemy | 337 | 2021 | |
| 60. | Rwanda | 2,067,148 | 2021 | |
| 19. | Russia | 6,361,393 | 2021 | |
| 86. | Romania | 919,389 | 2021 | |
| 87. | Republic of Congo | 888,532 | 2021 | |
| 153. | Qatar | 114,126 | 2021 | |
| 139. | Puerto Rico | 210,475 | 2021 | |
| 106. | Portugal | 484,517 | 2021 | |
| 70. | Poland | 1,718,177 | 2021 | |
| 10. | Philippines | 12,982,141 | 2021 | |
| 50. | Peru | 2,680,161 | 2021 | |
| 98. | Paraguay | 574,553 | 2021 | |
| 92. | Papua New Guinea | 785,453 | 2021 | |
| 117. | Panama | 329,964 | 2021 | |
| 220. | Palau | 1,199 | 2021 | |
| 6. | Pakistan | 21,053,992 | 2021 | |
| 110. | Oman | 411,075 | 2021 | |
| 130. | Norway | 268,305 | 2021 | |
| 208. | Northern Mariana Islands | 3,556 | 2021 | |
| 68. | North Korea | 1,806,942 | 2021 | |
| 3. | Nigeria | 33,565,992 | 2021 | |
| 26. | Niger | 4,512,240 | 2021 | |
| 101. | Nicaragua | 519,174 | 2021 | |
| 122. | New Zealand | 297,510 | 2021 | |
| 180. | New Caledonia | 20,844 | 2021 | |
| 190. | Netherlands Antilles | 10,021 | 2021 | |
| 85. | Netherlands | 938,270 | 2021 | |
| 40. | Nepal | 3,223,243 | 2021 | |
| 222. | Nauru | 1,027 | 2021 | |
| 142. | Namibia | 200,967 | 2021 | |
| 23. | Myanmar | 4,917,998 | 2021 | |
| 24. | Mozambique | 4,819,457 | 2021 | |
| 47. | Morocco | 2,899,133 | 2021 | |
| 227. | Montserrat | 295 | 2021 | |
| 173. | Montenegro | 30,922 | 2021 | |
| 120. | Mongolia | 305,339 | 2021 | |
| 223. | Monaco | 866 | 2021 | |
| 145. | Moldova | 185,749 | 2021 | |
| 12. | Mexico | 10,383,654 | 2021 |
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