| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Одолена-Вода | city | Stredocesky Kraj | Czech Republic | 50.23 | 14.41 | 830 | 16320 |
| Олешнице | city | Pardubicky Kraj | Czech Republic | 49.56 | 16.42 | 1925 | 2431 |
| Олешњице | city | Pardubicky Kraj | Czech Republic | 49.56 | 16.42 | 1925 | 2431 |
| Олешњице в Орлицких хорах | city | Kralovehradecky Kraj | Czech Republic | 50.37 | 16.31 | 2073 | 5198 |
| Оломоутс | city | Olomoucky Kraj | Czech Republic | 49.59 | 17.25 | 830 | 57054 |
| Оломоуц | city | Olomoucky Kraj | Czech Republic | 49.59 | 17.25 | 830 | 57054 |
| Опава | city | Moravskoslezsky Kraj | Czech Republic | 49.94 | 17.90 | 885 | 52931 |
| Орловице | city | Jihomoravsky Kraj | Czech Republic | 49.24 | 17.09 | 1669 | 4420 |
| Осек | city | Czech Republic | 50.62 | 13.69 | 885 | 31248 | |
| Ославани | city | Jihomoravsky Kraj | Czech Republic | 49.12 | 16.34 | 875 | 5825 |
| Особлага | city | Moravskoslezsky Kraj | Czech Republic | 50.27 | 17.71 | 830 | 3825 |
| Особлаха | city | Moravskoslezsky Kraj | Czech Republic | 50.27 | 17.71 | 830 | 3825 |
| Острава | city | Moravskoslezsky Kraj | Czech Republic | 49.81 | 18.26 | 830 | 125247 |
| Островачице | city | Jihomoravsky Kraj | Czech Republic | 49.21 | 16.41 | 1151 | 11647 |
| Отроковице | city | Zlinsky Kraj | Czech Republic | 49.20 | 17.54 | 830 | 34515 |