| Olcnava | 053 61 | Postcode Olcnava » Spisska Nova Ves » Slovakia |  |
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| Oleandrová | 821 07 | Postcode Oleandrova (street) » Bratislava » Slovakia | | |
| Olejkárska | 811 09 | Postcode Olejkarska (street) » Bratislava » Slovakia | | |
| Olejníkov | 082 57 | Postcode Olejnikov » Sabinov » Slovakia | | |
| Olešná | 023 52 | Postcode Olesna » Cadca » Slovakia | | |
| Olichov | 951 87 | Postcode Olichov » Zlate Moravce » Slovakia | | |
| Olivová | 831 01 | Postcode Olivova (street) » Bratislava » Slovakia | | |
| Olivová | 040 01 | Postcode Olivova (street) » Kosice » Slovakia | | |
| Olivová | 949 01 | Postcode Olivova (street) » Nitra » Slovakia | | |
| Olivová | 917 05 | Postcode Olivova (street) » Trnava » Slovakia | | |
| Olováry | 991 22 | Postcode Olovary » Velky Krtis » Slovakia | | |
| Olympijská | 917 01 | Postcode Olympijska (street) » Trnava » Slovakia | | |
| Olšina | 075 01 | Postcode Olsina » Trebisov » Slovakia | | |
| Olšovany | 044 19 | Postcode Olsovany » Kosice-okolie » Slovakia | | |
| Olšová | 831 06 | Postcode Olsova (street) » Bratislava » Slovakia | | |
| Omastiná | 956 41 | Postcode Omastina » Banovce nad Bebravou » Slovakia | | |
| Omská | 040 01 | Postcode Omska (street) » Kosice » Slovakia | | |
| Omšenie | 914 43 | Postcode Omsenie » Trencin » Slovakia | | |
| Ondavka | 086 36 | Postcode Ondavka » Bardejov » Slovakia | | |
| Ondavská | 821 08 | Postcode Ondavska (street) » Bratislava » Slovakia | | |
| Ondavská | 040 11 | Postcode Ondavska (street) » Kosice » Slovakia | | |
| Ondavská | 080 05 | Postcode Ondavska (street) » Presov » Slovakia | | |
| Ondavská | 093 01 | Postcode Ondavska (street) » Vranov nad Toplou » Slovakia | | |
| Ondavská | 010 01 | Postcode Ondavska (street) » Zilina » Slovakia | | |
| Ondavské Matiašovce | 094 01 | Postcode Ondavske Matiasovce » Vranov nad Toplou » Slovakia | | |
