Prior to 2011, only the major cities of Lima and Callao used postal codes.
However, in February 2011 a nationwide system was implemented which employs a five-digit numeric format.
Regardless, it can be understood that all five postal zones are within the Department of Amazonas, since they all begin with the digits 01.
Final digits other than "0" or "5" tend to denote urban or built-up areas, though this is not always the case.
01: City of Chachapoyas 10: Churuja 20: San Carlos 30: Jazán 31: Pedro Ruiz Gallo 40: Cuispes 50: Florida 51: Pomacochas 60: Yambrasbamba 61: Monte Puyo Conservation Area 10: Quinjalca 20: Chiliquín 30: Asunción 40: Recta 50: Jumbilla 60: Chisquilla 70: Corosha 80: Olleros Bongará 05: Soloco 10: San Francisco de Daguas 15: Cheto 20: Molinopampa 25: Vista Alegre 30: Mariscal Benavides 35: San Nicolás 40: Omia 41: Omia 45: Longar 50: Cochamal 55: Huambo 60: Santa Rosa 65: Totora 70: Limabamba 75: Milpuc 80: Chirimoto Rodríguez de Mendoza 05: San Isidro de Maino 10: Magdalena 15: Tingo 20: Colcamar 25: Longuita 30: María 35: San Juan de Lopecancha 40: La Jalca 41: Juan Velasco Alvarado University 45: Santo Tomás 50: San Francisco del Yeso 55: Mariscal Castilla 60: Montevideo 65: Leimebamba 70: Chuquibamba 75: Balsas 80: Cocabamba 85: Pisuquia 86: Chuilon Luya 05: Inguilpata 10: Luya 15: Lámud 20: San Cristóbal 25: San Jerónimo 30: Conila 35: Ocumal 40: Providencia 45: Ocalli 50: Camporredondo 51: Camporredondo (city) 55: Lonya Grande 56: Lonya Grande (city) 60: Yamón 65: Cumba 66: Cumba (city) 70: Trita 75: Luya Viejo 80: Santa Catalina Utcubamba 10: Jamalca 11: Jamalca (city) 20: Bagua Grande 21: Bagua Grande Village 30: El Milagro 31: El Milagro (city) Bongará 01: Cajaruro (city) 10: Copallín 11:Copallin (city) 20: Bagua 21: Bagua (town) 30: El Parco 40: La Peca 41: La Peca (village) Bagua 01: Aramango (town) 10: Imaza 11: Chiriaco [no] 20: El Cenepa 21: Huampami 30: Nieva 31: Santa María de Nieva 40: Río Santiago 41: Puerto Galilea Condorcanqui The historical list of postal codes from Lima and Callao is shown below.