| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Obdokovská Pusta | city | Nitriansky | Slovakia | 48.50 | 18.05 | 830 | 7152 |
| Obeckov | city | Banskobystricky | Slovakia | 48.17 | 19.33 | 830 | 14181 |
| Ober-Metzenseifen | city | Kosicky | Slovakia | 48.71 | 20.90 | 1210 | 5954 |
| Ober-Metzenseifen,Vysni Medzev,Vyšní Medzev | city | Kosicky | Slovakia | 48.71 | 20.90 | 1210 | 5954 |
| Ober-Stuben | city | Zilinsky | Slovakia | 48.83 | 18.88 | 2509 | 6375 |
| Ober-Turcek | city | Zilinsky | Slovakia | 48.76 | 18.93 | 2568 | 4090 |
| Obermetzenseifen | city | Kosicky | Slovakia | 48.71 | 20.90 | 1210 | 5954 |
| Oberneustadel | city | Zilinsky | Slovakia | 49.30 | 18.78 | 1669 | 32511 |
| Oberrauschenbach | city | Presovsky | Slovakia | 49.30 | 20.57 | 2509 | 5840 |
| Oberrepasch | city | Presovsky | Slovakia | 49.07 | 20.69 | 2847 | 2557 |
| Oberripsch | city | Presovsky | Slovakia | 49.07 | 20.69 | 2847 | 2557 |
| Oberschwaben | city | Slovakia | 49.40 | 20.38 | 1669 | 7662 | |
| Oberswidnik | city | Presovsky | Slovakia | 49.31 | 21.57 | 830 | 14893 |
| Oberufer | city | Bratislavsky | Slovakia | 48.14 | 17.18 | 410 | 128540 |
| Obid | city | Nitriansky | Slovakia | 47.78 | 18.65 | 357 | 17166 |
| Obisovce | city | Presovsky | Slovakia | 48.86 | 21.24 | 862 | 8013 |
| Oborin | city | Kosicky | Slovakia | 48.54 | 21.88 | 305 | 2336 |
| Obracanikovia | city | Zilinsky | Slovakia | 49.37 | 18.50 | 2509 | 5489 |
| Obrucne | city | Presovsky | Slovakia | 49.30 | 20.98 | 2509 | 4901 |
| Obručná | city | Banskobystricky | Slovakia | 48.19 | 19.88 | 1669 | 4224 |
| Obsolovce | city | Nitriansky | Slovakia | 48.50 | 18.01 | 830 | 5609 |
| Obyce | city | Nitriansky | Slovakia | 48.43 | 18.46 | 1669 | 9919 |
| Obysovce,Obyšovce | city | Presovsky | Slovakia | 48.86 | 21.24 | 862 | 8013 |
| Obyšovce | city | Presovsky | Slovakia | 48.86 | 21.24 | 862 | 8013 |