| Osušie | 991 02 | Postcode Osusie » Velky Krtis » Slovakia |  |
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| Osvaldova | 949 01 | Postcode Osvaldova (street) » Nitra » Slovakia | | |
| Osvaldova | 917 01 | Postcode Osvaldova (street) » Trnava » Slovakia | | |
| Osvetová | 821 05 | Postcode Osvetova (street) » Bratislava » Slovakia | | |
| Osvety | 010 04 | Postcode Osvety (street) » Zilina » Slovakia | | |
| Osvienčimská | 911 01 | Postcode Osviencimska (street) » Trencin » Slovakia | | |
| Osádka | 026 01 | Postcode Osadka » Dolny Kubin » Slovakia | | |
| Otonelova | 902 01 | Postcode Otonelova (street) » Pezinok » Slovakia | | |
| Otonelská | 831 02 | Postcode Otonelska (street) » Bratislava » Slovakia | | |
| Otrhánky | 956 55 | Postcode Otrhanky » Banovce nad Bebravou » Slovakia | | |
| Otročok | 982 62 | Postcode Otrocok » Revuca » Slovakia | | |
| Ovocinárska | 949 01 | Postcode Ovocinarska (street) » Nitra » Slovakia | | |
| Ovocinárska | 949 11 | Postcode Ovocinarska (street) » Nitra » Slovakia | | |
| Ovocinárska | 010 01 | Postcode Ovocinarska (street) » Zilina » Slovakia | | |
| Ovocná | 974 01 | Postcode Ovocna (street) » Banska Bystrica » Slovakia | | |
| Ovocná | 969 01 | Postcode Ovocna (street) » Banska Stiavnica » Slovakia | | |
| Ovocná | 851 10 | Postcode Ovocna (street) » Bratislava » Slovakia | | |
| Ovocná | 911 01 | Postcode Ovocna (street) » Trencin » Slovakia | | |
| Ovocná | 917 08 | Postcode Ovocna (street) » Trnava » Slovakia | | |
| Ovručská | 831 02 | Postcode Ovrucska (street) » Bratislava » Slovakia | | |
| Ovručská | 040 22 | Postcode Ovrucska (street) » Kosice » Slovakia | | |
| Ovsená | 040 01 | Postcode Ovsena (street) » Kosice » Slovakia | | |
| Ovsená | 010 01 | Postcode Ovsena (street) » Zilina » Slovakia | | |
| Ovsištské námestie | 851 04 | Postcode Ovsistske namestie (street) » Bratislava » Slovakia | | |
| Ovčiarska | 821 06 | Postcode Ovciarska (street) » Bratislava » Slovakia | | |
