src: i.ytimg.com
Postal codes in Indonesia, known in Indonesian as kodepos, 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),
- The fourth digit indicates the subdistrict 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 :
- The third digit indicates the district (kecamatan)
- The fourth digit indicates the subdistrict (kelurahan)
- The fifth digit is a "0".
There are postal code zones covering the Indonesian provinces or islands as follows :
Source of the article : Wikipedia