Biharia euroregion (Romanian: Euroregiunea Biharia, Hungarian: Biharia Eurorégió) is a euroregion located in Romania and Hungary.
Oradea which is the largest city of the euroregion.| City | Population | Metro | Country |
|---|---|---|---|
| Oradea | 206,614 | 260,000 |  Romania
|
| Debrecen | 205,084 | 237,888 |  Hungary
|
| Hajdúböszörmény | 32,228 | N/A | Hungary
|
| Hajdúszoboszló | 23,695 | N/A | Hungary
|
| Balmazújváros | 18,615 | N/A | Hungary
|
| Hajdúnánás | 18,185 | N/A | Hungary
|
| Salonta | 18,137 | N/A | Romania
|
| Marghita | 17,291 | N/A | Romania
|
| Berettyóújfalu | 16,227 | N/A | Hungary
|
| Püspökladány | 16,126 | N/A | Hungary
|
| Hajdúhadház | 13,001 | N/A | Hungary
|
| Beiuş | 12,089 | N/A | Romania
|
| Săcueni | 11,665 | N/A | Romania
|
| Hajdúsámson | 10,946 | N/A | Hungary
|
| Aleşd | 10,852 | N/A | Romania
|
| Valea lui Mihai | 10,317 | N/A | Romania
|
| Ştei | 9,466 | N/A | Romania
|
| Derecske | 9,086 | N/A | Hungary
|
