| Province | ZIP (from ... to) | Population | Municipalities |
|---|---|---|---|
| Bergamo | 24010 ... 24069 24121 ... 24129 (CAP Bergamo) | 1,114,780 | 243 |
| Brescia | 25010 ... 25089 25121 ... 25136 (CAP Brescia) | 1,265,884 | 205 |
| Como | 22010 ... 22100 | 598,191 | 147 |
| Cremona | 26010 ... 26100 | 353,923 | 113 |
| Lecco | 23801 ... 23900 | 333,747 | 84 |
| Lodi | 26811 ... 26900 | 230,250 | 60 |
| Mantua | 46010 ... 46100 | 407,744 | 64 |
| Milan | 20001 ... 20099 20121 ... 20162 (CAP Milan) | 3,246,455 | 133 |
| Monza and Brianza | 20811 ... 20900 | 879,303 | 55 |
| Pavia | 27010 ... 27100 | 541,949 | 185 |
| Sondrio | 23009 ... 23100 | 179,100 | 77 |
| Varese | 21009 ... 21100 | 882,592 | 136 |