| Place | Post Code |
|---|---|
| Baranowo, Mikołajki | 11-730 |
| Cimowo, Mikołajki | 11-730 |
| Cudnochy, Mikołajki | 11-730 |
| Dybowo, Mikołajki | 11-730 |
| Faszcze, Mikołajki | 11-730 |
| Górkło, Mikołajki | 11-730 |
| Grabek, Mikołajki | 11-730 |
| Grabnik Mały, Mikołajki | 11-730 |
| Grabówek, Mikołajki | 11-730 |
| Grabówka, Mikołajki | 11-730 |
| Inulec, Mikołajki | 11-730 |
| Jora Wielka, Mikołajki | 11-730 |
| Kolonia Mikołajki, Mikołajki | 11-730 |
| Kulinowo, Mikołajki | 11-730 |
| Lelek, Mikołajki | 11-730 |
| Lisiny, Mikołajki | 11-730 |
| Lisunie, Mikołajki | 11-730 |
| Lubiewo, Mikołajki | 11-730 |
| Łuknajno, Mikołajki | 11-730 |
| Mateuszek, Mikołajki | 11-730 |
| Mikołajki, Mikołajki | 11-730 |
| Nowe Sady, Mikołajki | 11-730 |
| Olszewo, Mikołajki | 11-730 |
| Prawdowo, Mikołajki | 11-730 |
| Pszczółki, Mikołajki | 11-730 |
| Śmietki, Mikołajki | 11-730 |
| All postal codes in Mrągowski | |
|---|---|
| Mikołajki, Mrągowski | |
| Mrągowo, Mrągowski | |
| Mrągowo (Gmina), Mrągowski | |
| Piecki, Mrągowski | |
| Sorkwity, Mrągowski | |