The World: Population - Age 0-4 (1981) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 1. | Indonesia | 22,645,544 | 1981 | |
| 2. | Brazil | 17,773,214 | 1981 | |
| 3. | Bangladesh | 17,003,352 | 1981 | |
| 4. | United States of America | 16,892,720 | 1981 | |
| 5. | Pakistan | 15,507,805 | 1981 | |
| 6. | Nigeria | 14,408,349 | 1981 | |
| 7. | Mexico | 10,901,782 | 1981 | |
| 8. | Philippines | 8,560,559 | 1981 | |
| 9. | Ethiopia | 6,775,120 | 1981 | |
| 10. | Turkey | 6,750,678 | 1981 | |
| 11. | Democratic Republic of the Congo | 5,538,188 | 1981 | |
| 12. | Myanmar | 5,007,779 | 1981 | |
| 13. | Tanzania | 3,698,602 | 1981 | |
| 14. | Kenya | 3,579,696 | 1981 | |
| 15. | Colombia | 3,573,050 | 1981 | |
| 16. | Argentina | 3,390,825 | 1981 | |
| 17. | Peru | 2,640,585 | 1981 | |
| 18. | Uganda | 2,513,709 | 1981 | |
| 19. | Nepal | 2,497,175 | 1981 | |
| 20. | Afghanistan | 2,383,362 | 1981 | |
| 21. | Mozambique | 2,180,674 | 1981 | |
| 22. | Malaysia | 2,078,260 | 1981 | |
| 23. | Sri Lanka | 1,987,272 | 1981 | |
| 24. | Ghana | 1,963,894 | 1981 | |
| 25. | Syria | 1,765,384 | 1981 | |
| 26. | Cote d'Ivoire | 1,705,226 | 1981 | |
| 27. | Cameroon | 1,686,800 | 1981 | |
| 28. | Madagascar | 1,636,869 | 1981 | |
| 29. | Angola | 1,420,354 | 1981 | |
| 30. | Mali | 1,415,660 | 1981 | |
| 31. | Burkina Faso | 1,286,314 | 1981 | |
| 32. | Malawi | 1,259,141 | 1981 | |
| 33. | Niger | 1,230,746 | 1981 | |
| 34. | Guatemala | 1,227,637 | 1981 | |
| 35. | Zambia | 1,160,011 | 1981 | |
| 36. | Senegal | 1,146,214 | 1981 | |
| 37. | Cambodia | 1,139,918 | 1981 | |
| 38. | Rwanda | 1,058,162 | 1981 | |
| 39. | Somalia | 1,038,669 | 1981 | |
| 40. | Haiti | 897,454 | 1981 | |
| 41. | Dominican Republic | 855,599 | 1981 | |
| 42. | Chad | 839,718 | 1981 | |
| 43. | Burundi | 834,570 | 1981 | |
| 44. | Guinea | 796,332 | 1981 | |
| 45. | Benin | 702,949 | 1981 | |
| 46. | Honduras | 667,269 | 1981 | |
| 47. | Libya | 601,454 | 1981 | |
| 48. | Sierra Leone | 579,160 | 1981 | |
| 49. | Nicaragua | 541,342 | 1981 | |
| 50. | Serbia | 531,320 | 1981 | |
| 51. | Togo | 527,732 | 1981 | |
| 52. | Papua New Guinea | 525,869 | 1981 | |
| 53. | Paraguay | 500,754 | 1981 | |
| 54. | Eritrea | 482,096 | 1981 | |
| 55. | Jordan | 417,257 | 1981 | |
| 56. | Central African Republic | 410,857 | 1981 | |
| 57. | Lebanon | 405,069 | 1981 | |
| 58. | Liberia | 342,038 | 1981 | |
| 59. | Republic of Congo | 304,476 | 1981 | |
| 60. | Mauritania | 289,783 | 1981 | |
| 61. | Panama | 278,895 | 1981 | |
| 62. | Kosovo | 234,518 | 1981 | |
| 63. | Lesotho | 231,950 | 1981 | |
| 64. | Namibia | 199,583 | 1981 | |
| 65. | Botswana | 178,857 | 1981 | |
| 66. | Guinea-Bissau | 145,418 | 1981 | |
| 67. | Trinidad and Tobago | 141,802 | 1981 | |
| 68. | Swaziland | 121,977 | 1981 | |
| 69. | Gabon | 110,512 | 1981 | |
| 70. | Guyana | 104,001 | 1981 | |
| 71. | Bhutan | 79,470 | 1981 | |
| 72. | Comoros | 63,550 | 1981 | |
| 73. | Djibouti | 59,290 | 1981 | |
| 74. | Cape Verde | 51,223 | 1981 | |
| 75. | Suriname | 46,820 | 1981 | |
| 76. | Bahrain | 46,261 | 1981 | |
| 77. | Solomon Islands | 45,077 | 1981 | |
| 78. | Brunei | 28,641 | 1981 | |
| 79. | Belize | 27,349 | 1981 | |
| 80. | Samoa | 26,454 | 1981 | |
| 81. | The Bahamas | 26,121 | 1981 | |
| 82. | Western Sahara | 24,698 | 1981 | |
| 83. | Barbados | 22,591 | 1981 | |
| 84. | Vanuatu | 21,589 | 1981 | |
| 85. | Saint Lucia | 18,634 | 1981 | |
| 86. | Sao Tome and Principe | 17,835 | 1981 | |
| 87. | Grenada | 12,645 | 1981 | |
| 88. | Dominica | 9,566 | 1981 | |
| 89. | Seychelles | 8,227 | 1981 | |
| 90. | Saint Kitts and Nevis | 5,497 | 1981 | |
| 91. | Aruba | 5,209 | 1981 | |
| 92. | Tuvalu | 857 | 1981 |
