| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Butterworth, Seberang Perai Utara | 12000, 12100, 12200, 12300, 13000, … |
| Postal/ZIP Codes in Kepala Batas, Seberang Perai Utara | 13200, 13210, 13220 |
| Postal/ZIP Codes in Penaga, Seberang Perai Utara | 13100, 13110 |
| Postal/ZIP Codes in Tasek Gelugor, Seberang Perai Utara | 13300, 13310 |
| Postal/ZIP Codes in Tasek Gelugur, Seberang Perai Utara | 13300 |