| population on 1st January | |  4 968 991 | 4 967 306 | 4 965 390 | 4 977 097 | 4 985 221 | 4 991 319 | 4 995 840 | 5 015 966 | 5 031 436 | 5 044 045 | 5 059 482 | 5 061 946 | 5 053 540 | 5 041 754 | 5 028 266 | 5 004 400 | 4 977 900 | 4 942 188 | 4 908 548 |
| live births | | 9 217 | 51 234 | 51 899 | 51 728 | 50 791 | 49 940 | 49 186 | 49 837 | 49 217 | 48 083 | 47 130 | 46 314 | 44 494 | 44 876 | 43 307 | 41 641 | 41 479 | 40 649 | .. |
| deaths | | 8 900 | 46 068 | 48 554 | 44 718 | 46 904 | 45 979 | 48 286 | 47 762 | 49 529 | 47 975 | 50 009 | 51 243 | 49 641 | 49 665 | 53 117 | 49 989 | 54 358 | 51 983 | .. |
| registrations from other municipalities | | 11 950 | 93 081 | 94 315 | 99 648 | 100 761 | 101 106 | 102 178 | 103 601 | 103 277 | 103 344 | 92 342 | 109 767 | 99 985 | 89 369 | 84 065 | 86 643 | 84 782 | 87 633 | .. |
| deregistrations to other municipalities | | 13 392 | 107 747 | 103 802 | 109 885 | 107 230 | 107 296 | 107 938 | 111 770 | 105 511 | 105 043 | 100 461 | 122 959 | 112 864 | 101 205 | 98 915 | 103 623 | 104 117 | 108 850 | .. |
| immigrated from other countries | | 2 042 | 18 897 | 29 271 | 24 093 | 20 844 | 20 949 | 36 072 | 33 320 | 27 517 | 28 258 | 24 128 | 19 164 | 18 700 | 18 674 | 19 117 | 18 079 | 19 161 | 21 251 | .. |
| emigrated to other countries | | 2 602 | 11 313 | 11 422 | 12 742 | 12 164 | 14 199 | 11 086 | 11 756 | 12 362 | 11 230 | 10 666 | 9 449 | 12 460 | 15 537 | 18 323 | 19 251 | 22 659 | 22 340 | .. |
| population on 31st December | | 4 967 306 | 4 965 390 | 4 977 097 | 4 985 221 | 4 991 319 | 4 995 840 | 5 015 966 | 5 031 436 | 5 044 045 | 5 059 482 | 5 061 946 | 5 053 540 | 5 041 754 | 5 028 266 | 5 004 400 | 4 977 900 | 4 942 188 | 4 908 548 | .. |
| foreigners who acquired Italian citizenship | | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .. |