| City | 2026 Pop. ↓ |
|---|---|
| Karaj | 1,549,130 |
| Kermanshah | 1,170,300 |
| Kerman | 544,332 |
| Khoram Abad | 429,419 |
| Kashan | 372,404 |
| Khomeyni Shahr | 252,065 |
| Kamal Shahr | 233,573 |
| Khuy | 194,685 |
| Khoramshahr | 140,772 |
| Kashmar | 131,517 |
| Kazerun | 112,360 |
| Kuhdasht | 81,888 |
| Khomeyn | 78,887 |
| Kahnuj | 75,352 |
| Kamyaran | 66,429 |
| Kish | 65,706 |
| Konarak | 63,762 |
| Khash | 61,888 |
| Kahrizak | 61,872 |
| Khoramdareh | 61,470 |
| Kalaleh | 59,644 |
| Kut-e Abdallah | 56,252 |
| Khurmuj | 55,302 |
| Khvorzuq | 48,067 |
| Kangavar | 47,402 |
| Kavar | 45,954 |
| Khvaf | 45,185 |
| Kordkuy | 43,364 |
| Khalkhal | 35,831 |
| Kelishad va Sudarjan | 28,400 |