Postal codes in Croatia are 5 digit numeric. There are 20 two digit zones defined. Zagreb City and Zagreb County have one, each other first level administrative country subdivision, i.e. one of the counties of Croatia, has its own range.
From the 10 possible 1 digit ranges only 5 are assigned:
1 Zagreb region,
2 Southern Croatia,
3 Eastern Croatia,
4 Central Croatia except Zagreb region,
5 Western Croatia.
In the range 1xxxx only one two digit range namely 10xxx is assigned, the maximum of subranges exists is in the 4xxxx range with 7 ranges.
Range
Location
10xxx
City of Zagreb and Zagreb County
20xxx
Dubrovnik-Neretva County
21xxx
Split-Dalmatia County
22xxx
Šibenik-Knin County
23xxx
Zadar County
31xxx
Osijek-Baranja County
32xxx
Vukovar-Srijem County
33xxx
Virovitica-Podravina County
34xxx
Požega-Slavonia County
35xxx
Brod-Posavina County
40xxx
Međimurje County
42xxx
Varaždin County
43xxx
Bjelovar-Bilogora County
44xxx
Sisak-Moslavina County
47xxx
Karlovac County
48xxx
Koprivnica-Križevci County
49xxx
Krapina-Zagorje County
51xxx
Primorje-Gorski Kotar County
52xxx
Istria County
53xxx
Lika-Senj County
Three cities have a postal code with 4 zeros: 10000 Zagreb, 20000 Dubrovnik, 40000 Čakovec.
Range
City
County
10000
Zagreb
Zagreb County
20000
Dubrovnik
Dubrovnik–Neretva County
21000
Split
Split-Dalmatia County
22000
Šibenik
Šibenik-Knin County
23000
Zadar
Zadar County
31000
Osijek
Osijek-Baranja County
32000
Vukovar
Vukovar-Syrmia County
33000
Virovitica
Virovitica–Podravina County
34000
Požega
Požega-Slavonia County
35000
Slavonski Brod
Brod–Posavina County
40000
Čakovec
Međimurje County
42000
Varaždin
Varaždin County
43000
Bjelovar
Bjelovar–Bilogora County
44000
Sisak
Sisak–Moslavina County
47000
Karlovac
Karlovac County
48000
Koprivnica
Koprivnica-Križevci County
49000
Krapina
Krapina-Zagorje County
51000
Rijeka
Primorje-Gorski Kotar County
52000
Pazin
Istria County
53000
Gospić
Lika-Senj County
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