| Locality | Post Code |
|---|---|
| De Santa Catarina, Ecatzingo | 56990 |
| Ecatzingo de Hidalgo, Ecatzingo | 56990 |
| Huexotitla, Ecatzingo | 56996 |
| Ixtactepectípac (Rancho Ixtactepectípac), Ecatzingo | 56996 |
| Nexapa, Ecatzingo | 56999 |
| Oxpanco, Ecatzingo | 56993 |
| San José, Ecatzingo | 56990 |
| San Juan Tlacotompa (Tlacotompa), Ecatzingo | 56996 |
| San Marcos Tecomaxusco, Ecatzingo | 56993 |
| San Martín, Ecatzingo | 56990 |
| Santa Catarina, Ecatzingo | 56990 |
| Santa Gertrudis, Ecatzingo | 56990 |
| Tepicila, Ecatzingo | 56993 |
| Xolaltenco, Ecatzingo | 56990 |