Postal codes in Slovakia use the old system of Czechoslovakia.
The system of PSČ numbers (PSČ, stands for Slovak: Poštové smerovacie číslo - postal routing number) was introduced in former Czechoslovakia in 1973 and has remained unchanged. The postal code consists of five digits, usually written with a space in the form XXX XX. The first digit indicates a region:
8 - the capital of Slovakia,
Bratislava. The second digit represents one of the five districts of Bratislava. The codes 860 01-899 99 are not assigned to any region and serve for internal purposes of the postal system.
9 - southern and western Slovakia: 911 01
Trenčín, 917 01
Trnava, 949 01
Nitra, 960 01
Zvolen, 974 01
Banská Bystrica, 984 01
Lučenec
0 - northern and eastern Slovakia: 010 01
Žilina, 036 01
Martin, 040 01 - 044 99
Košice, 058 01
Poprad, 071 01
Michalovce, 080 01
Prešov).
Regions 1 to 7 were reserved for the
Czech republic, and are located there. The postal codes of Slovakia and Czech republic do not overlap.
When writing the address, the postal code is put in front of the town name; when typed or printed, 1 space separates the leading 3 digits from the trailing 2 digits, and 2 spaces separate the postal code from the town name, e.g.:
Kúpeľná 1/A
811 02 Bratislava 1
On envelopes and postcards there are usually five rectangular boxes below the address field for the postal code digits.
On postal items being sent from abroad it is recommended to prepend the postal code with the ISO 3166-1 two-letter code of the country and a dash:
Kúpeľná 1/A
SK-811 02 Bratislava 1 Slovakia