Hajdú–Bihar County
| Hajdú–Bihar County Hajdú-Bihar vármegye | |
|---|---|
| Hajdú-Bihar County within Hungary | |
| Country | Hungary | 
| Region | Northern Great Plain | 
| County seat | Debrecen | 
| Districts | |
| Government | |
| • President of the General Assembly | Zoltán Pajna (Fidesz-KDNP) | 
| Area | |
|  • Total | 6,210.51 km2 (2,397.89 sq mi) | 
| • Rank | 4th in Hungary | 
| Population  (2018) | |
|  • Total | 530,464 | 
| • Rank | 4th in Hungary | 
| GDP | |
| • Total | HUF 1,348 billion €4.330 billion (2016) | 
| Postal code | 40xx – 422x, 4241 – 4243, 425x – 429x | 
| Area code(s) | (+36) 52, 54 | 
| ISO 3166 code | HU-HB | 
| Website | hbmo | 
Hajdú–Bihar (Hungarian: Hajdú-Bihar vármegye, pronounced [ˈhɒjduː ˈbihɒr]) is an administrative county (comitatus or vármegye) in eastern Hungary, on the border with Romania. It shares borders with the Hungarian counties Szabolcs-Szatmár-Bereg, Borsod–Abaúj–Zemplén, Jász–Nagykun–Szolnok and Békés. The capital of Hajdú-Bihar county is Debrecen. Together with Bihor County in Romania it constitutes the Biharia Euroregion.