The following are the zip codes in the municipalities and cities of Negros Occidental.
| Region | Provinces | City/Municipality | Zip Code |
| NIR (Negros Island Region) | Negros Occidental | Bacolod City | 6100 |
| NIR (Negros Island Region) | Negros Occidental | Bago City | 6101 |
| NIR (Negros Island Region) | Negros Occidental | Binalbagan | 6107 |
| NIR (Negros Island Region) | Negros Occidental | Cadiz City | 6121 |
| NIR (Negros Island Region) | Negros Occidental | Calatrava | 6126 |
| NIR (Negros Island Region) | Negros Occidental | Candoni | 6110 |
| NIR (Negros Island Region) | Negros Occidental | Enrique Magalona | 6118 |
| NIR (Negros Island Region) | Negros Occidental | Escalante | 6124 |
| NIR (Negros Island Region) | Negros Occidental | Himamaylan | 6108 |
| NIR (Negros Island Region) | Negros Occidental | Hinigaran | 6106 |
| NIR (Negros Island Region) | Negros Occidental | Hinoba-ari | 6114 |
| NIR (Negros Island Region) | Negros Occidental | Ilog | 6109 |
| NIR (Negros Island Region) | Negros Occidental | Isabela | 6128 |
| NIR (Negros Island Region) | Negros Occidental | Kabangkalan | 6100 |
| NIR (Negros Island Region) | Negros Occidental | Kauayan | 6112 |
| NIR (Negros Island Region) | Negros Occidental | La Carlota City | 6130 |
| NIR (Negros Island Region) | Negros Occidental | La Castillana | 6131 |
| NIR (Negros Island Region) | Negros Occidental | Manapla | 6120 |
| NIR (Negros Island Region) | Negros Occidental | Moises Padilla | 6132 |
| NIR (Negros Island Region) | Negros Occidental | Murcia | 6129 |
| NIR (Negros Island Region) | Negros Occidental | Paraiso (Fabrica) | 6123 |
| NIR (Negros Island Region) | Negros Occidental | Pulupandan | 6102 |
| NIR (Negros Island Region) | Negros Occidental | Pontevedra | 6105 |
| NIR (Negros Island Region) | Negros Occidental | Sagay | 6122 |
| NIR (Negros Island Region) | Negros Occidental | San Carlos City | 6127 |
| NIR (Negros Island Region) | Negros Occidental | San Enrique | 6104 |
| NIR (Negros Island Region) | Negros Occidental | Silay City | 6116 |
| NIR (Negros Island Region) | Negros Occidental | Silay Hawaiian Central | 6117 |
| NIR (Negros Island Region) | Negros Occidental | Sipalay | 6113 |
| NIR (Negros Island Region) | Negros Occidental | Talisay | 6115 |
| NIR (Negros Island Region) | Negros Occidental | Toboso | 6125 |
| NIR (Negros Island Region) | Negros Occidental | Villadolid | 6103 |
| NIR (Negros Island Region) | Negros Occidental | Victorias | 6119 |
