| Orovnica | 966 52 | Postcode Orovnica » Zarnovica » Slovakia |  |
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| Ortov | 072 14 | Postcode Ortov » Michalovce » Slovakia | | |
| Ortutská cesta | 974 05 | Postcode Ortutska cesta (street) » Banska Bystrica » Slovakia | | |
| Ortuťová | 086 12 | Postcode Ortutova » Bardejov » Slovakia | | |
| Ortvaňová | 040 14 | Postcode Ortvanova (street) » Kosice » Slovakia | | |
| Ortáše | 044 44 | Postcode Ortase » Kosice-okolie » Slovakia | | |
| Ortáše | 080 01 | Postcode Ortase (street) » Presov » Slovakia | | |
| Orávka | 980 42 | Postcode Oravka » Rimavska Sobota » Slovakia | | |
| Oráčska | 831 06 | Postcode Oracska (street) » Bratislava » Slovakia | | |
| Osada | 984 01 | Postcode Osada (street) » Lucenec » Slovakia | | |
| Osada Sekier | 960 01 | Postcode Osada Sekier (street) » Zvolen » Slovakia | | |
| Osada verejnej čisto | 984 01 | Postcode Osada verejnej cisto (street) » Lucenec » Slovakia | | |
| Osadná | 969 01 | Postcode Osadna (street) » Banska Stiavnica » Slovakia | | |
| Osadná | 831 03 | Postcode Osadna (street) » Bratislava » Slovakia | | |
| Osadná | 031 01 | Postcode Osadna (street) » Liptovsky Mikulas » Slovakia | | |
| Osadná | 917 02 | Postcode Osadna (street) » Trnava » Slovakia | | |
| Osadné | 067 34 | Postcode Osadne » Snina » Slovakia | | |
| Osikov | 086 42 | Postcode Osikov » Bardejov » Slovakia | | |
| Osiková | 821 07 | Postcode Osikova (street) » Bratislava » Slovakia | | |
| Osiková | 040 01 | Postcode Osikova (street) » Kosice » Slovakia | | |
| Osiková | 010 07 | Postcode Osikova (street) » Zilina » Slovakia | | |
| Oskorušová | 841 01 | Postcode Oskorusova (street) » Bratislava » Slovakia | | |
| Oskorušová | 949 01 | Postcode Oskorusova (street) » Nitra » Slovakia | | |
| Oslany | 972 47 | Postcode Oslany » Prievidza » Slovakia | | |
| Oslobodenia | 010 04 | Postcode Oslobodenia (street) » Zilina » Slovakia | | |
