Population, Total (Persons)
| 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| Gitega | 701.793 | 760.451 | 797.554 | 822.870 | 848.292 | 873.718 | 899.046 |
| Ngozi | 707.402 | 692.812 | 726.615 | 749.679 | 772.839 | 796.004 | 819.079 |
| Muyinga | 580.770 | 663.129 | 717.559 | 717.559 | 739.727 | 761.900 | 783.986 |
| Kirundo | 591.690 | 658.774 | 690.372 | 736.685 | 734.870 | 756.896 | 778.838 |
| Kayanza | 526.358 | 613.849 | 643.799 | 664.234 | 684.755 | 705.280 | 725.725 |
| Bujumbura Mairie | 383.132 | 521.316 | 546.752 | 564.107 | 581.534 | 598.964 | 616.328 |
| Bujumbura Rural | 499.491 | 582.938 | 544.700 | 630.786 | 650.274 | 669.764 | 576.226 |
| Cibitoke | 471.616 | 482.801 | 506.357 | 522.430 | 538.570 | 554.713 | 570.793 |
| Karuzi | 417.560 | 457.644 | 479.972 | 495.206 | 510.504 | 525.806 | 541.051 |
| Makamba | 459.703 | 451.830 | 473.875 | 488.917 | 504.022 | 519.129 | 534.178 |
| Ruyigi | 383.132 | 419.986 | 440.477 | 454.459 | 468.499 | 482.542 | 496.530 |
| Bubanza | 345.536 | 354.443 | 371.736 | 383.536 | 395.385 | 407.236 | 419.041 |
| Rutana | 288.484 | 349.710 | 366.773 | 378.415 | 390.106 | 401.799 | 413.446 |
| Bururi | 493.889 | 601.896 | 631.263 | 651.301 | 671.422 | 631.263 | 388.147 |
| Muramvya | 279.336 | 306.802 | 321.771 | 331.984 | 342.241 | 352.499 | 362.717 |
| Mwaro | 253.017 | 286.411 | 300.385 | 309.920 | 319.495 | 329.071 | 338.611 |
| Cankuzo | 200.084 | 239.991 | 251.700 | 259.689 | 262.858 | 275.736 | 283.730 |