List of Romanian counties by population List of Romanian counties by population List of Romanian counties by population

| County | _1948 | _1956 | _1966 | _1977 | _1992 | _2002 | _2011 |
|---|---|---|---|---|---|---|---|
| ZZZ Bucharest | 1025180 | 1177661 | 1366684 | 1807239 | 2064474 | 1926334 | 1883425 |
| Iași | 431586 | 516635 | 619027 | 729243 | 806778 | 816910 | 772348 |
| Prahova | 557776 | 623817 | 701057 | 817168 | 873229 | 829945 | 762886 |
| Cluj | 520073 | 580344 | 629746 | 715507 | 735077 | 702755 | 691106 |
| Constanța | 311062 | 369940 | 465752 | 608817 | 748044 | 715151 | 684082 |
| Timiș | 588936 | 568881 | 607596 | 696884 | 700292 | 677926 | 683540 |
| Dolj | 615301 | 642028 | 691116 | 750328 | 761074 | 734231 | 660544 |
| Suceava | 439751 | 507674 | 572781 | 633899 | 700799 | 688435 | 634810 |
| Bacău | 414996 | 507937 | 598321 | 667791 | 736078 | 706623 | 616168 |
| Argeș | 448964 | 483741 | 529833 | 631918 | 680574 | 652625 | 612431 |
| Bihor | 536323 | 574488 | 586460 | 633094 | 634093 | 600246 | 575398 |
| Mureș | 461403 | 513261 | 561598 | 605345 | 607298 | 580851 | 550846 |