21 cities
| City | 2026 Pop. ↓ |
|---|---|
| Karaj | 1,627,960 |
| Kermanshah | 1,131,900 |
| Kahriz | 766,706 |
| Kerman | 564,192 |
| Khorramabad | 425,870 |
| Khorramshahr | 330,606 |
| Khomeyni Shahr | 277,334 |
| Khowy | 175,370 |
| Kuhdasht | 100,208 |
| Kashmar | 96,151 |
| Kazerun | 94,511 |
| Khomeyn | 77,425 |
| Khash | 69,603 |
| Kamyaran | 61,642 |
| Kangavar | 53,414 |
| Khalkhal | 51,024 |
| Khorramdarreh | 50,528 |
| Kalaleh | 33,700 |
| Kelishad va Sudarjan | 33,630 |
| Khvansar | 21,146 |
| Kish | 20,922 |