| Opiná | 044 47 | Postcode Opina » Kosice-okolie » Slovakia |  |
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| Opletalova | 841 07 | Postcode Opletalova (street) » Bratislava » Slovakia | | |
| Opoj | 919 32 | Postcode Opoj » Trnava » Slovakia | | |
| Oponice | 956 14 | Postcode Oponice » Topolcany » Slovakia | | |
| Opálová | 974 05 | Postcode Opalova (street) » Banska Bystrica » Slovakia | | |
| Opálová | 040 11 | Postcode Opalova (street) » Kosice » Slovakia | | |
| Opálová | 093 03 | Postcode Opalova (street) » Vranov nad Toplou » Slovakia | | |
| Opátka | 044 65 | Postcode Opatka » Kosice-okolie » Slovakia | | |
| Oranžová | 010 03 | Postcode Oranzova (street) » Zilina » Slovakia | | |
| Oravce | 976 33 | Postcode Oravce » Banska Bystrica » Slovakia | | |
| Oravné | 917 01 | Postcode Oravne (street) » Trnava » Slovakia | | |
| Oravská | 821 09 | Postcode Oravska (street) » Bratislava » Slovakia | | |
| Oravská | 040 01 | Postcode Oravska (street) » Kosice » Slovakia | | |
| Oravská | 949 01 | Postcode Oravska (street) » Nitra » Slovakia | | |
| Oravská | 080 01 | Postcode Oravska (street) » Presov » Slovakia | | |
| Oravská | 052 01 | Postcode Oravska (street) » Spisska Nova Ves » Slovakia | | |
| Oravská | 010 01 | Postcode Oravska (street) » Zilina » Slovakia | | |
| Oravská Jasenica | 029 64 | Postcode Oravska Jasenica » Namestovo » Slovakia | | |
| Oravská Lesná | 029 57 | Postcode Oravska Lesna » Namestovo » Slovakia | | |
| Oravská Polhora | 029 47 | Postcode Oravska Polhora » Namestovo » Slovakia | | |
| Oravská Poruba | 027 54 | Postcode Oravska Poruba » Dolny Kubin » Slovakia | | |
| Oravské Veselé | 029 62 | Postcode Oravske Vesele » Namestovo » Slovakia | | |
| Oravský Biely Potok | 027 42 | Postcode Oravsky Biely Potok » Tvrdosin » Slovakia | | |
| Oravský Podzámok | 027 41 | Postcode Oravsky Podzamok » Dolny Kubin » Slovakia | | |
| Orchideová | 821 07 | Postcode Orchideova (street) » Bratislava » Slovakia | | |
