| Postal Code | Postal Code Place Name | Province | Canton |
|---|---|---|---|
| 30101 | Oriental | Cartago | Cartago |
| 30102 | Occidental | Cartago | Cartago |
| 30103 | Carmen | Cartago | Cartago |
| 30104 | San Nicolás | Cartago | Cartago |
| 30105 | Aguacaliente o San Francisco | Cartago | Cartago |
| 30106 | Guadalupe o Arenilla | Cartago | Cartago |
| 30107 | Corralillo | Cartago | Cartago |
| 30108 | Tierra Blanca | Cartago | Cartago |
| 30109 | Dulce Nombre | Cartago | Cartago |
| 30110 | Llano Grande | Cartago | Cartago |
| 30111 | Quebradilla | Cartago | Cartago |
| 30201 | Paraíso | Cartago | Paraíso |
| 30202 | Santiago | Cartago | Paraíso |
| 30203 | Orosí | Cartago | Paraíso |
| 30204 | Cachí | Cartago | Paraíso |
| 30205 | Llanos de Santa Lucía | Cartago | Paraíso |
| 30301 | Tres Ríos | Cartago | La Unión |
| 30302 | San Diego | Cartago | La Unión |
| 30303 | San Juan | Cartago | La Unión |
| 30304 | San Rafael | Cartago | La Unión |
| 30305 | Concepción | Cartago | La Unión |
| 30306 | Dulce Nombre | Cartago | La Unión |
| 30307 | San Ramón | Cartago | La Unión |
| 30308 | Río Azul | Cartago | La Unión |
| 30401 | Juan Viñas | Cartago | Jiménez |
| 30402 | Tucurrique | Cartago | Jiménez |
| 30403 | Pejibaye | Cartago | Jiménez |
| 30501 | Turrialba | Cartago | Turrialba |
| 30502 | La Suiza | Cartago | Turrialba |
| 30503 | Peralta | Cartago | Turrialba |
| 30504 | Santa Cruz | Cartago | Turrialba |
| 30505 | Santa Teresita | Cartago | Turrialba |
| 30506 | Pavones | Cartago | Turrialba |
| 30507 | Tuis | Cartago | Turrialba |
| 30508 | Tayutic | Cartago | Turrialba |
| 30509 | Santa Rosa | Cartago | Turrialba |
| 30510 | Tres Equis | Cartago | Turrialba |
| 30511 | La Isabel | Cartago | Turrialba |
| 30512 | Chirripó | Cartago | Turrialba |
| 30601 | Pacayas | Cartago | Alvarado |
| 30602 | Cervantes | Cartago | Alvarado |
| 30603 | Capellades | Cartago | Alvarado |
| 30701 | San Rafael | Cartago | Oreamuno |
| 30702 | Cot | Cartago | Oreamuno |
| 30703 | Potrero Cerrado | Cartago | Oreamuno |
| 30704 | Cipreses | Cartago | Oreamuno |
| 30705 | Santa Rosa | Cartago | Oreamuno |
| 30801 | El Tejar | Cartago | El Guarco |
| 30802 | San Isidro | Cartago | El Guarco |
| 30803 | Tobosi | Cartago | El Guarco |
| 30804 | Patio de Agua | Cartago | El Guarco |