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Total area (Square kilometre)
| 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| Burgas | 7 973 | 7 748 | 7 748 | 7 748 | 7 747 | 7 747 | 7 747 | 7 748 | 7 644 |
| Sofia | 7 880 | 7 059 | 7 062 | 7 062 | 7 064 | 7 064 | 7 064 | 7 062 | 6 969 |
| Blagoevgrad | 6 449 | 6 452 | 6 450 | 6 450 | 6 451 | 6 451 | 6 451 | 6 450 | 6 290 |
| Plovdiv | 6 156 | 5 962 | 5 973 | 5 973 | 5 915 | 5 915 | 5 915 | 5 973 | 5 978 |
| Haskovo | 5 442 | 5 539 | 5 533 | 5 533 | 5 534 | 5 534 | 5 534 | 5 533 | 5 560 |
| Stara Zagora | 5 532 | 5 152 | 5 151 | 5 151 | 5 150 | 5 150 | 5 150 | 5 151 | 5 129 |
| Dobrich | 4 706 | 4 723 | 4 720 | 4 720 | 4 718 | 4 718 | 4 718 | 4 720 | 4 720 |
| Veliko Tarnovo | 4 646 | 4 663 | 4 662 | 4 662 | 4 662 | 4 662 | 4 662 | 4 662 | 4 666 |
| Pleven | 4 653 | 4 656 | 4 653 | 4 653 | 4 650 | 4 650 | 4 650 | 4 653 | 4 645 |
| Pazardzhik | 4 452 | 4 459 | 4 457 | 4 457 | 4 455 | 4 455 | 4 455 | 4 457 | 4 332 |
| Lovech | 4 136 | 4 129 | 4 129 | 4 129 | 4 136 | 4 136 | 4 136 | 4 129 | 4 141 |
| Varna | 3 832 | 3 819 | 3 820 | 3 820 | 3 822 | 3 822 | 3 822 | 3 819 | 3 822 |
| Montana (BG312) | 3 639 | 3 628 | 3 636 | 3 636 | 3 635 | 3 635 | 3 635 | 3 635 | 3 634 |
| Vratsa | 3 624 | 3 620 | 3 620 | 3 620 | 3 620 | 3 620 | 3 620 | 3 620 | 3 602 |
| Sliven | 3 554 | 3 544 | 3 544 | 3 544 | 3 544 | 3 544 | 3 544 | 3 544 | 3 536 |
| Shumen | 3 390 | 3 380 | 3 390 | 3 390 | 3 395 | 3 395 | 3 395 | 3 390 | 3 393 |
| Yambol | 3 404 | 3 356 | 3 356 | 3 356 | 3 355 | 3 355 | 3 355 | 3 356 | 3 355 |
| Kardzhali | 3 312 | 3 209 | 3 209 | 3 209 | 3 212 | 3 212 | 3 212 | 3 209 | 3 228 |
| Smolyan | 3 194 | 3 194 | 3 193 | 3 193 | 3 206 | 3 206 | 3 206 | 3 193 | 3 209 |
| Kyustendil | 3 055 | 3 052 | 3 052 | 3 052 | 3 063 | 3 063 | 3 063 | 3 052 | 3 086 |
| Vidin | 3 041 | 3 033 | 3 033 | 3 033 | 3 033 | 3 033 | 3 033 | 3 033 | 3 025 |
| Ruse | 2 780 | 2 791 | 2 803 | 2 803 | 2 861 | 2 861 | 2 861 | 2 803 | 2 859 |
| Silistra | 2 850 | 2 847 | 2 846 | 2 846 | 2 846 | 2 846 | 2 846 | 2 846 | 2 845 |
| Targovishte | 2 567 | 2 560 | 2 559 | 2 559 | 2 711 | 2 711 | 2 711 | 2 558 | 2 710 |
| Razgrad | 2 642 | 2 638 | 2 640 | 2 640 | 2 413 | 2 413 | 2 413 | 2 640 | 2 401 |
| Pernik | 2 391 | 2 393 | 2 394 | 2 394 | 2 392 | 2 392 | 2 392 | 2 394 | 2 366 |
| Gabrovo | 2 034 | 2 023 | 2 023 | 2 023 | 2 023 | 2 023 | 2 023 | 2 023 | 1 896 |
| Sofia (stolitsa) | 1 242 | 1 344 | 1 349 | 1 349 | 1 285 | 1 285 | 1 285 | 1 349 | 1 329 |