| name | type | Area (m²) | capital city | Country | continent | population (people) |
|---|---|---|---|---|---|---|
| Alba County | County | 6,241,999,872 | Romania | Europe | 327,224 | |
| Arad County | County | 7,753,999,872 | Romania | Europe | 409,072 | |
| Arges | County | 6,862,000,128 | Romania | Europe | 612,431 | |
| Bihor County | County | 7,544,000,000 | Romania | Europe | 575,398 | |
| Bistrița-Nasaud | County | 5,354,999,808 | Romania | Europe | 277,861 |