| Source | UN (World Urbanization Prospects 2018) |
| Date | 09 Apr 2026 |
| Code | City | Population | Share (%) | Rank | Change | |||
|---|---|---|---|---|---|---|---|---|
| 2025 | 2026 | Italy | World | Population | (%) | |||
| Napl | Naples | 2,767,923 | 2,754,762 | 4.66 | 1 | 182 | -13,161 | -0.48 |
| Mila | Milan | 2,599,022 | 2,595,301 | 4.39 | 2 | 194 | -3,721 | -0.14 |
| Roma | Roma (Rome) | 2,376,474 | 2,373,579 | 4.01 | 3 | 210 | -2,895 | -0.12 |
| Turi | Turin | 1,150,975 | 1,146,759 | 1.94 | 4 | 452 | -4,216 | -0.37 |
| Pale | Palermo | 667,442 | 663,488 | 1.12 | 5 | 820 | -3,954 | -0.59 |
| Geno | Genoa | 532,509 | 530,676 | 0.897 | 6 | 1054 | -1,833 | -0.34 |
| Cata | Catania | 453,376 | 450,904 | 0.762 | 7 | 1249 | -2,472 | -0.55 |
| Bolo | Bologna | 443,849 | 443,223 | 0.749 | 8 | 1268 | -626 | -0.14 |
| Flor | Florence | 430,806 | 430,158 | 0.727 | 9 | 1316 | -648 | -0.15 |
| Berg | Bergamo | 398,050 | 397,467 | 0.672 | 10 | 1446 | -583 | -0.15 |
| Bust | Busto Arsizio | 302,759 | 302,290 | 0.511 | 11 | 1928 | -469 | -0.15 |
| Cagl | Cagliari | 253,786 | 252,632 | 0.427 | 12 | 2338 | -1,154 | -0.45 |
| Case | Caserta | 252,391 | 250,231 | 0.423 | 13 | 2366 | -2,160 | -0.86 |
| Bari | Bari | 221,727 | 220,496 | 0.373 | 14 | 2713 | -1,231 | -0.56 |
| Vero | Verona | 214,569 | 213,972 | 0.362 | 15 | 2801 | -597 | -0.28 |
| Bres | Brescia | 206,859 | 206,543 | 0.349 | 16 | 2922 | -316 | -0.15 |
| Pesc | Pescara | 203,814 | 203,574 | 0.344 | 17 | 2967 | -240 | -0.12 |
| Padu | Padua | 201,341 | 201,076 | 0.340 | 18 | 3006 | -265 | -0.13 |
| Mess | Messina | 181,238 | 179,937 | 0.304 | 19 | 3395 | -1,301 | -0.72 |
| Prat | Prato | 179,411 | 179,148 | 0.303 | 20 | 3417 | -263 | -0.15 |
| Trie | Trieste | 178,118 | 177,901 | 0.301 | 21 | 3443 | -217 | -0.12 |
| Mest | Mestre | 157,931 | 157,719 | 0.267 | 22 | 3890 | -212 | -0.13 |
| Mode | Modena | 151,920 | 151,684 | 0.256 | 23 | 4055 | -236 | -0.16 |
| Livo | Livorno | 148,529 | 148,301 | 0.251 | 24 | 4148 | -228 | -0.15 |
| Parm | Parma | 145,925 | 145,700 | 0.246 | 25 | 4236 | -225 | -0.15 |
| Tara | Taranto | 135,161 | 134,401 | 0.227 | 26 | 4589 | -760 | -0.56 |
| Piol | Pioltello | 129,321 | 129,133 | 0.218 | 27 | 4800 | -188 | -0.15 |
| Regg | Reggio Calabria | 128,298 | 127,576 | 0.216 | 28 | 4850 | -722 | -0.56 |
| Fogg | Foggia | 126,561 | 125,826 | 0.213 | 29 | 4921 | -735 | -0.58 |
| Gall | Gallarate | 125,831 | 125,637 | 0.212 | 30 | 4933 | -194 | -0.15 |
| Sale | Salerno | 123,331 | 122,795 | 0.208 | 31 | 5063 | -536 | -0.43 |
| Acil | Acilia | 119,970 | 119,814 | 0.203 | 32 | 5191 | -156 | -0.13 |
| Regg | Reggio nell'Emilia | 115,633 | 115,460 | 0.195 | 33 | 5400 | -173 | -0.15 |
| Garb | Garbagnate Milanese | 113,600 | 113,427 | 0.192 | 34 | 5508 | -173 | -0.15 |
| Como | Como | 109,180 | 109,012 | 0.184 | 35 | 5738 | -168 | -0.15 |
| Bolz | Bolzano - Bozen | 106,831 | 106,693 | 0.180 | 36 | 5857 | -138 | -0.13 |
| Rimi | Rimini | 105,885 | 105,746 | 0.179 | 37 | 5916 | -139 | -0.13 |