UpAlphabetical listing of Places in Hajdu-Bihar
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Olasztanya | city | Hajdu-Bihar | Hungary | 47.08 | 21.40 | 301 | 2170 |
| Olaszzug | city | Hajdu-Bihar | Hungary | 47.10 | 21.33 | 305 | 1360 |
| Olyvostanya | city | Hajdu-Bihar | Hungary | 47.13 | 21.47 | 311 | 2539 |
| Oláhtanya | city | Hajdu-Bihar | Hungary | 47.22 | 21.68 | 321 | 3023 |
| Oncsatelep | city | Hajdu-Bihar | Hungary | 47.68 | 21.67 | 830 | 17391 |
| Orbantanya | city | Hajdu-Bihar | Hungary | 47.63 | 20.90 | 275 | 4292 |
| Oregszolloskert | city | Hajdu-Bihar | Hungary | 47.43 | 21.96 | 830 | 4519 |
| Oregszoloskert | city | Hajdu-Bihar | Hungary | 47.43 | 21.96 | 830 | 4519 |
| Ornsteintanya | city | Hajdu-Bihar | Hungary | 47.40 | 21.67 | 360 | 6305 |
| Orotveny | city | Hajdu-Bihar | Hungary | 47.88 | 21.15 | 311 | 6480 |
| Orotveny Koze | city | Hajdu-Bihar | Hungary | 47.88 | 21.15 | 311 | 6480 |
| Orvenyszog | city | Hajdu-Bihar | Hungary | 47.80 | 21.15 | 305 | 1901 |
| Orvenyszogtanya | city | Hajdu-Bihar | Hungary | 47.80 | 21.15 | 305 | 1901 |
| Ostordulo | city | Hajdu-Bihar | Hungary | 47.45 | 21.40 | 331 | 14263 |
| Osveny | city | Hajdu-Bihar | Hungary | 47.53 | 21.90 | 830 | 6676 |
| Ozes | city | Hajdu-Bihar | Hungary | 47.42 | 21.03 | 298 | 1176 |
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