| Ovčiarsko | 010 04 | Postcode Ovciarsko » Zilina » Slovakia |  |
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| Ovčiarsko | 010 04 | Postcode Ovciarsko (street) » Zilina » Slovakia | | |
| Ovčie | 082 38 | Postcode Ovcie » Presov » Slovakia | | |
| Ozdín | 985 24 | Postcode Ozdin » Poltar » Slovakia | | |
| Ozorovská - nová | 957 01 | Postcode Ozorovska - nova (street) » Banovce nad Bebravou » Slovakia | | |
| Ozorovská hlavná | 957 01 | Postcode Ozorovska hlavna (street) » Banovce nad Bebravou » Slovakia | | |
| Očkov | 916 22 | Postcode Ockov » Nove Mesto n.Vahom » Slovakia | | |
| Očovská | 851 02 | Postcode Ocovska (street) » Bratislava » Slovakia | | |
| Očová | 962 23 | Postcode Ocova » Zvolen » Slovakia | | |
| Oľdza | 930 39 | Postcode Oldza » Dunajska Streda » Slovakia | | |
| Oľka | 067 04 | Postcode Olka » Medzilaborce » Slovakia | | |
| Oľšavce | 086 46 | Postcode Olsavce » Bardejov » Slovakia | | |
| Oľšavica | 053 73 | Postcode Olsavica » Levoca » Slovakia | | |
| Oľšavka | 053 61 | Postcode Olsavka » Spisska Nova Ves » Slovakia | | |
| Oľšavka | 090 22 | Postcode Olsavka » Stropkov » Slovakia | | |
| Oľšinkov | 067 16 | Postcode Olsinkov » Medzilaborce » Slovakia | | |
| Oľšov | 082 76 | Postcode Olsov » Sabinov » Slovakia | | |
| Oškerda | 023 32 | Postcode Oskerda » Kysucke Nove Mesto » Slovakia | | |
| Oštepová | 040 01 | Postcode Ostepova (street) » Kosice » Slovakia | | |
| Oščadnica | 023 01 | Postcode Oscadnica » Cadca » Slovakia | | |
| Ožvoldíkova | 841 02 | Postcode Ozvoldikova (street) » Bratislava » Slovakia | | |
| Ožďany | 980 11 | Postcode Ozdany » Rimavska Sobota » Slovakia | | |
| Ôsma | 831 01 | Postcode Osma (street) » Bratislava » Slovakia | | |
