Isabela ZIP Codes, Postal Codes, and Phone Area Codes
Also known as “The Queen Province of the North”, Isabela is located in the Cagayan Valley region. It has a total area of 12,414.93 square kilometers and is composed of 34 municipalities, 2 component cities, 1 independent city, and 1,018 barangays. Its capital city is Ilagan. Places to visit in Isabela are Bonsai Forest, Dicotcotan Beach, and the Crocodile Sanctuary of San Mariano.
| Location | ZIP Code/Postal Code | Phone Area Code |
| Alicia | 3306 | 78 |
| Angadanan | 3307 | 78 |
| Aurora | 3316 | 78 |
| Benito Soliven | 3331 | 78 |
| Burgos | 3322 | 78 |
| Cabagan | 3328 | 78 |
| Cabatuan | 3315 | 78 |
| Cauayan | 3305 | 78 |
| Cordon | 3312 | 78 |
| Delfin Albano | 3326 | 78 |
| Dinapigui | 3336 | 78 |
| Divilacan | 3335 | 78 |
| Echague | 3309 | 78 |
| Gamu | 3301 | 78 |
| Ilagan | 3300 | 78 |
| Jones | 3313 | 78 |
| Luna | 3304 | 78 |
| Maconacon | 3333 | 78 |
| Mallig | 3323 | 78 |
| Naguillan | 3302 | 78 |
| Palanan | 3334 | 78 |
| Quezon | 3324 | 78 |
| Quirino | 3321 | 78 |
| Ramon | 3319 | 78 |
| Reina Mercedes | 3303 | 78 |
| Roxas | 3320 | 78 |
| San Agustin | 3314 | 78 |
| San Guillermo | 3308 | 78 |
| San Isidro | 3310 | 78 |
| San Miguel (Callang) | 3317 | 78 |
| San Mariano | 3332 | 78 |
| San Mateo | 3318 | 78 |
| San Pablo | 3329 | 78 |
| Santa Maria | 3330 | 78 |
| Santiago | 3311 | 78 |
| Santo Tomas | 3327 | 78 |
| Tumauini | 3325 | 78 |
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