| Ondrašovce | 082 33 | Postcode Ondrasovce » Presov » Slovakia |  |
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| Ondrašová | 038 22 | Postcode Ondrasova » Turcianske Teplice » Slovakia | | |
| Ondrej | 059 12 | Postcode Ondrej » Poprad » Slovakia | | |
| Ondrej nad Hronom | 976 62 | Postcode Ondrej nad Hronom » Banska Bystrica » Slovakia | | |
| Ondrejovce | 935 51 | Postcode Ondrejovce » Levice » Slovakia | | |
| Ondrejovova | 821 03 | Postcode Ondrejovova (street) » Bratislava » Slovakia | | |
| Ondrejská | 831 06 | Postcode Ondrejska (street) » Bratislava » Slovakia | | |
| Ondrochov | 941 02 | Postcode Ondrochov » Nove Zamky » Slovakia | | |
| Ondrášovská | 031 05 | Postcode Ondrasovska (street) » Liptovsky Mikulas » Slovakia | | |
| Onča | 076 52 | Postcode Onca » Trebisov » Slovakia | | |
| Opatovce | 913 11 | Postcode Opatovce » Trencin » Slovakia | | |
| Opatovce - Výčapy | 951 44 | Postcode Opatovce - Vycapy » Nitra » Slovakia | | |
| Opatovce nad Nitrou | 972 02 | Postcode Opatovce nad Nitrou » Prievidza » Slovakia | | |
| Opatovská | 040 01 | Postcode Opatovska (street) » Kosice » Slovakia | | |
| Opatovská | 911 01 | Postcode Opatovska (street) » Trencin » Slovakia | | |
| Opatovská Nová Ves | 991 07 | Postcode Opatovska Nova Ves » Velky Krtis » Slovakia | | |
| Opatovský Sokolec | 930 28 | Postcode Opatovsky Sokolec » Dunajska Streda » Slovakia | | |
| Opatová | 911 01 | Postcode Opatova » Trencin » Slovakia | | |
| Opatová | 935 25 | Postcode Opatova » Levice » Slovakia | | |
| Opatová | 984 01 | Postcode Opatova » Lucenec » Slovakia | | |
| Opatové Moravce | 962 71 | Postcode Opatove Moravce » Krupina » Slovakia | | |
| Opava | 991 25 | Postcode Opava » Velky Krtis » Slovakia | | |
| Opavská | 831 01 | Postcode Opavska (street) » Bratislava » Slovakia | | |
| Opavská | 031 04 | Postcode Opavska (street) » Liptovsky Mikulas » Slovakia | | |
| Opavská | 080 05 | Postcode Opavska (street) » Presov » Slovakia | | |
