The following are the zip codes in the municipalities and city of Ilocos Norte.
| Region | Provinces | City/Municipality | Zip Code |
|---|---|---|---|
| Region 1 (Ilocos Region) | Ilocos Norte | Vintar | 2915 |
| Region 1 (Ilocos Region) | Ilocos Norte | Solsona | 2910 |
| Region 1 (Ilocos Region) | Ilocos Norte | Sarrat | 2914 |
| Region 1 (Ilocos Region) | Ilocos Norte | San Nicolas | 2901 |
| Region 1 (Ilocos Region) | Ilocos Norte | Pinili | 2905 |
| Region 1 (Ilocos Region) | Ilocos Norte | Piddig | 2912 |
| Region 1 (Ilocos Region) | Ilocos Norte | Pasuquin | 2917 |
| Region 1 (Ilocos Region) | Ilocos Norte | Paoay | 2902 |
| Region 1 (Ilocos Region) | Ilocos Norte | Pagudpud | 2919 |
| Region 1 (Ilocos Region) | Ilocos Norte | Nueva Era | 2909 |
| Region 1 (Ilocos Region) | Ilocos Norte | Marcos | 2907 |
| Region 1 (Ilocos Region) | Ilocos Norte | Laoag City | 2900 |
| Region 1 (Ilocos Region) | Ilocos Norte | Banna (formerly Espiritu) | 2908 |
| Region 1 (Ilocos Region) | Ilocos Norte | Dumalneg | 2921 |
| Region 1 (Ilocos Region) | Ilocos Norte | Dingras | 2913 |
| Region 1 (Ilocos Region) | Ilocos Norte | Currimao | 2903 |
| Region 1 (Ilocos Region) | Ilocos Norte | Carasi | 2911 |
| Region 1 (Ilocos Region) | Ilocos Norte | Burgos | 2918 |
| Region 1 (Ilocos Region) | Ilocos Norte | Batac | 2906 |
| Region 1 (Ilocos Region) | Ilocos Norte | Bangui | 2920 |
| Region 1 (Ilocos Region) | Ilocos Norte | Badoc | 2904 |
| Region 1 (Ilocos Region) | Ilocos Norte | Bacarra | 2916 |
| Region 1 (Ilocos Region) | Ilocos Norte | Adams | 2922 |
