In term of bars/cafes you can find 8 location in the region (like "Elit", "Korzo"). In term of restaurants you can find 5 places (like "Druga Kuća", "Bonaparte").
For supermarkets you have 4 locations. As "Marin", 1 butchers exist in the area. You can find 1 bakeries locally like "Dan i Noć"
About pharmacies, 3 possibilities exist (like "7.April", "bPharm").
For gas stations you have 1 places with "Nešković" for example.
You can find 1 banks and/or ATMs locally like "NLB Banka" In term of police stations you can find 1 location in the region (like "Policijska stanica Kostajnica"). For town halls you have 2 places with "Grad Hrvatska Kostajnica", "Opština Kostajnica" for example. About parks, 2 possibilities exist (like "Trg Nikole Šubića Zrinskog", "Trg kralja Petra I. Oslobodioca").
The major streets are the following: Svetosavska, Trg Kralja Petra I. Oslobodioca, Baljska, Unska.
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