| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Foxton, Horowhenua | 4473, 4477, 4814, 4815, 4891, … |
| Postal/ZIP Codes in Hokio Beach, Horowhenua | 5571 |
| Postal/ZIP Codes in Koputaroa, Horowhenua | 5571, 5575 |
| Postal/ZIP Codes in Levin, Horowhenua | 5510, 5570, 5571, 5572, 5574, … |
| Postal/ZIP Codes in Manakau, Horowhenua | 5570, 5573, 5583 |
| Postal/ZIP Codes in Moutoa, Horowhenua | 4893, 5572 |
| Postal/ZIP Codes in Muhunoa East, Horowhenua | 5570 |
| Postal/ZIP Codes in Ohau, Horowhenua | 5570 |
| Postal/ZIP Codes in Opiki, Horowhenua | 4474 |
| Postal/ZIP Codes in Palmerston North, Horowhenua | 4474 |
| Postal/ZIP Codes in Shannon, Horowhenua | 4474, 4821 |
| Postal/ZIP Codes in Tiakitahuna, Horowhenua | 4474 |
| Postal/ZIP Codes in Waikawa Beach, Horowhenua | 5573 |