| population | |
| Khomeyn | 105017 |
| Shahrestan-e Arak | 591756 |
| Shahrestan-e Ashtian | 16357 |
| Shahrestan-e Delijan | 51621 |
| population | |
| Shahrestan-e Farahan | 28994 |
| Shahrestan-e Khondab | 54018 |
| Shahrestan-e Komijan | 36441 |
| Shahrestan-e Mahallat | 55342 |
| population | |
| Shahrestan-e Saveh | 283538 |
| Shahrestan-e Shazand | 117571 |
| Shahrestan-e Zarandiyeh | 63907 |
| Tafresh | 24913 |
 | Arak Airport | ~ 21.75 km |
| Hamadan Airport | ~ 131.50 km |
| Kashan Airport | ~ 167.75 km |
| Imam Khomeini International Airport | ~ 170.21 km |
| Khoram Abad Airport | ~ 174.50 km |
| Payam Karaj International Airport | ~ 184.15 km |
| Mehrabad International Airport | ~ 202.23 km |
| Qazvin Airport | ~ 212.91 km |
| Hesa Airport | ~ 223.54 km |
