Qazvin's 2025 population is now estimated at 444,984. In 1950, the population of Qazvin was 55,506. Qazvin has grown by 4,942 in the last year, which represents a 1.12% annual change.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Qazvin, which typically includes Qazvin's population in addition to adjacent suburban areas.
| City | 2025 Pop. ↓ | Growth |
|---|---|---|
| Tehran | 9,729,740 | 1.18% |
| Mashhad | 3,460,660 | 1.32% |
| Esfahan | 2,327,990 | 1.46% |
| Shiraz | 1,763,900 | 1.21% |
| Tabriz | 1,695,670 | 1.05% |
| Karaj | 1,614,660 | 0.73% |
| Qom | 1,392,280 | 1.34% |
| Ahvaz | 1,324,800 | 1.18% |
| Kermanshah | 1,117,360 | 1.43% |
| Orumiyeh | 860,169 | 1.38% |
| Rasht | 757,765 | 1.16% |
| Bandar Abbas | 690,978 | 1.92% |
| Zahedan | 643,702 | 1.08% |
| Ardabil | 614,154 | 1.35% |
| Hamadan | 611,801 | 1.12% |
| Yazd | 609,302 | 1.31% |
| Arak | 589,740 | 1.24% |
| Kerman | 559,142 | 0.84% |
| Eslamshahr | 553,083 | 1.64% |
| Zanjan | 509,683 | 1.44% |
| Sanandaj | 482,664 | 1.39% |
| Qazvin | 444,984 | 1.12% |
| Khorramabad | 420,998 | 1.22% |
| Shahriyar | 420,092 | 2.08% |
| Gorgan | 391,519 | 1.17% |
| Qods | 357,183 | 1.32% |
| Kashan | 356,957 | 1.4% |
| Sari | 338,115 | 1.07% |
