| population on 1st January | |  1 631 880 | 1 630 004 | 1 632 083 | 1 634 673 | 1 637 508 | 1 640 194 | 1 643 052 | 1 649 058 | 1 653 129 | 1 653 711 | 1 655 833 | 1 655 079 | 1 654 583 | 1 652 528 | 1 648 642 | 1 642 492 | 1 636 839 | 1 631 040 | 1 622 257 |
| live births | | 2 472 | 13 155 | 13 571 | 13 124 | 13 226 | 13 256 | 13 383 | 13 470 | 13 508 | 13 538 | 13 032 | 12 444 | 11 872 | 11 473 | 11 082 | 10 527 | 10 142 | 9 438 | .. |
| deaths | | 2 684 | 13 786 | 14 612 | 13 397 | 14 102 | 13 873 | 14 272 | 14 474 | 14 996 | 14 533 | 15 085 | 15 626 | 15 216 | 15 445 | 16 528 | 16 143 | 16 773 | 16 277 | .. |
| registrations from other municipalities | | 3 163 | 33 644 | 33 415 | 34 139 | 36 018 | 37 899 | 37 557 | 38 641 | 36 420 | 36 341 | 33 828 | 40 044 | 37 804 | 33 353 | 31 976 | 32 360 | 33 077 | 32 798 | .. |
| deregistrations to other municipalities | | 4 408 | 33 796 | 34 171 | 34 425 | 35 539 | 37 230 | 37 337 | 38 711 | 37 768 | 37 276 | 35 276 | 40 645 | 38 405 | 33 851 | 33 145 | 33 634 | 34 368 | 34 786 | .. |
| immigrated from other countries | | 628 | 5 591 | 6 973 | 6 184 | 6 064 | 5 740 | 9 525 | 8 516 | 7 266 | 7 875 | 5 944 | 6 088 | 5 601 | 4 481 | 5 079 | 6 128 | 7 767 | 5 957 | .. |
| emigrated to other countries | | 1 047 | 2 729 | 2 586 | 2 790 | 2 981 | 2 934 | 2 850 | 3 371 | 3 848 | 3 823 | 3 197 | 2 801 | 3 711 | 3 897 | 4 614 | 4 891 | 5 644 | 5 913 | .. |
| population on 31st December | | 1 630 004 | 1 632 083 | 1 634 673 | 1 637 508 | 1 640 194 | 1 643 052 | 1 649 058 | 1 653 129 | 1 653 711 | 1 655 833 | 1 655 079 | 1 654 583 | 1 652 528 | 1 648 642 | 1 642 492 | 1 636 839 | 1 631 040 | 1 622 257 | .. |
| foreigners who acquired Italian citizenship | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .. |