The World: Population - Age 0-4 (2015) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 59. | Zimbabwe | 2,011,204 | 2015 | |
| 46. | Zambia | 2,883,073 | 2015 | |
| 33. | Yemen | 3,781,399 | 2015 | |
| 162. | Western Sahara | 78,728 | 2015 | |
| 120. | West Bank | 312,781 | 2015 | |
| 222. | Wallis and Futuna | 1,081 | 2015 | |
| 16. | Vietnam | 7,489,812 | 2015 | |
| 51. | Venezuela | 2,731,028 | 2015 | |
| 179. | Vanuatu | 22,170 | 2015 | |
| 55. | Uzbekistan | 2,389,262 | 2015 | |
| 141. | Uruguay | 218,880 | 2015 | |
| 4. | United States of America | 21,740,424 | 2015 | |
| 31. | United Kingdom | 3,863,751 | 2015 | |
| 109. | United Arab Emirates | 461,085 | 2015 | |
| 57. | Ukraine | 2,107,683 | 2015 | |
| 14. | Uganda | 8,004,013 | 2015 | |
| 199. | U.S. Virgin Islands | 6,111 | 2015 | |
| 219. | Tuvalu | 1,173 | 2015 | |
| 205. | Turks and Caicos Islands | 4,040 | 2015 | |
| 106. | Turkmenistan | 474,984 | 2015 | |
| 19. | Turkey | 6,802,043 | 2015 | |
| 87. | Tunisia | 898,073 | 2015 | |
| 161. | Trinidad and Tobago | 82,375 | 2015 | |
| 187. | Tonga | 12,242 | 2015 | |
| 77. | Togo | 1,161,107 | 2015 | |
| 128. | The Gambia | 272,497 | 2015 | |
| 178. | The Bahamas | 24,850 | 2015 | |
| 27. | Thailand | 4,207,088 | 2015 | |
| 21. | Tanzania | 6,323,153 | 2015 | |
| 82. | Tajikistan | 958,558 | 2015 | |
| 80. | Taiwan | 1,010,299 | 2015 | |
| 53. | Syria | 2,500,603 | 2015 | |
| 115. | Switzerland | 365,022 | 2015 | |
| 107. | Sweden | 470,536 | 2015 | |
| 147. | Swaziland | 169,149 | 2015 | |
| 169. | Suriname | 47,101 | 2015 | |
| 15. | Sudan | 7,633,321 | 2015 | |
| 68. | Sri Lanka | 1,789,939 | 2015 | |
| 54. | Spain | 2,455,116 | 2015 | |
| 58. | South Korea | 2,045,146 | 2015 | |
| 25. | South Africa | 4,437,577 | 2015 | |
| 66. | Somalia | 1,798,692 | 2015 | |
| 163. | Solomon Islands | 76,971 | 2015 | |
| 160. | Slovenia | 86,416 | 2015 | |
| 126. | Slovakia | 281,304 | 2015 | |
| 213. | Sint Maarten | 2,548 | 2015 | |
| 137. | Singapore | 228,785 | 2015 | |
| 84. | Sierra Leone | 948,930 | 2015 | |
| 198. | Seychelles | 6,461 | 2015 | |
| 118. | Serbia | 330,086 | 2015 | |
| 56. | Senegal | 2,186,697 | 2015 | |
| 52. | Saudi Arabia | 2,530,814 | 2015 | |
| 174. | Sao Tome and Principe | 30,200 | 2015 | |
| 217. | San Marino | 1,535 | 2015 | |
| 184. | Samoa | 20,366 | 2015 | |
| 196. | Saint Vincent and the Grenadines | 7,074 | 2015 | |
| 228. | Saint Pierre and Miquelon | 243 | 2015 | |
| 212. | Saint Martin | 2,764 | 2015 | |
| 188. | Saint Lucia | 11,148 | 2015 | |
| 208. | Saint Kitts and Nevis | 3,538 | 2015 | |
| 225. | Saint Helena | 394 | 2015 | |
| 226. | Saint Barthélemy | 363 | 2015 | |
| 61. | Rwanda | 1,958,073 | 2015 | |
| 17. | Russia | 7,373,760 | 2015 | |
| 79. | Romania | 1,015,641 | 2015 | |
| 90. | Republic of Congo | 806,471 | 2015 | |
| 155. | Qatar | 104,057 | 2015 | |
| 140. | Puerto Rico | 218,890 | 2015 | |
| 101. | Portugal | 524,714 | 2015 | |
| 62. | Poland | 1,886,610 | 2015 | |
| 10. | Philippines | 12,694,717 | 2015 | |
| 50. | Peru | 2,744,324 | 2015 | |
| 98. | Paraguay | 548,183 | 2015 | |
| 93. | Papua New Guinea | 779,471 | 2015 | |
| 117. | Panama | 331,626 | 2015 | |
| 221. | Palau | 1,129 | 2015 | |
| 5. | Pakistan | 21,362,168 | 2015 | |
| 113. | Oman | 375,224 | 2015 | |
| 133. | Norway | 256,889 | 2015 | |
| 203. | Northern Mariana Islands | 4,163 | 2015 | |
| 71. | North Korea | 1,738,805 | 2015 | |
| 3. | Nigeria | 30,302,308 | 2015 | |
| 34. | Niger | 3,764,244 | 2015 | |
| 100. | Nicaragua | 529,223 | 2015 | |
| 123. | New Zealand | 293,657 | 2015 | |
| 182. | New Caledonia | 20,705 | 2015 | |
| 191. | Netherlands Antilles | 9,914 | 2015 | |
| 86. | Netherlands | 913,936 | 2015 | |
| 40. | Nepal | 3,111,441 | 2015 | |
| 220. | Nauru | 1,153 | 2015 | |
| 142. | Namibia | 213,847 | 2015 | |
| 24. | Myanmar | 4,932,343 | 2015 | |
| 26. | Mozambique | 4,266,461 | 2015 | |
| 45. | Morocco | 2,951,245 | 2015 | |
| 227. | Montserrat | 292 | 2015 | |
| 172. | Montenegro | 34,213 | 2015 | |
| 119. | Mongolia | 314,399 | 2015 | |
| 223. | Monaco | 1,004 | 2015 | |
| 139. | Moldova | 220,395 | 2015 | |
| 12. | Mexico | 10,534,623 | 2015 |
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