| Ilocos Norte | |
| Area | Zip |
| Adams | 2922 |
| Bacarra | 2916 |
| Badoc | 2904 |
| Bangui | 2920 |
| Batac | 2906 |
| Burgos | 2918 |
| Carasi | 2911 |
| Currimao | 2903 |
| Dingras | 2913 |
| Dumalneg | 2921 |
| Espiritu | 2908 |
| Laoag City | 2900 |
| Marcos | 2907 |
| Nueva Era | 2909 |
| Pagudpud | 2919 |
| Paoay | 2902 |
| Pasuquin | 2917 |
| Piddig | 2912 |
| Pinili | 2905 |
| San Nicolas | 2901 |
| Sarrat | 2914 |
| Solsona | 2910 |
| Vintar | 2915 |
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