Postal codes in Indonesia, known in Indonesian as kode pos consist of 5 digits.
- The first digit indicates the region in which a given post office falls in,
- The second and third digits indicate the regency (kabupaten) or city (kota madya),
- The fourth digit indicates the district or kecamatan within the kabupaten or kota,
- The fifth digit indicates the commune or village or kelurahan/desa.
There is an exception for Jakarta postal codes:[1]
- The third digit indicates the district (kecamatan)
- The fourth digit indicates the urban village (kelurahan)
- The fifth digit is a "0".
There are postal code zones covering the Indonesian provinces or islands as follows:[1]
| First digit | Postal zone |
|---|---|
| 1 | Jakarta metropolitan area[2] |
| 2 | Northern half of Sumatra, comprising the provinces of Aceh, North Sumatra, West Sumatra, Riau and Riau Islands. |
| 3 | Southern half of Sumatra, comprising the provinces of Bengkulu, Jambi, Bangka Belitung, South Sumatra and Lampung. |
| 4 | The provinces of Banten and West Java (except those parts within the Jakarta metropolitan area [3]). |
| 5 | The province of Central Java and the Yogyakarta Special Region. |
| 6 | The province of East Java. |
| 7 | Kalimantan (the Indonesian part of Borneo island). |
| 8 | The provinces of Bali, West Nusa Tenggara and East Nusa Tenggara (the Lesser Sunda Islands). |
| 9 | Sulawesi (Celebes), Maluku (Moluccas), and Papua (Western New Guinea). |
